News for hackers. Stuff that matters.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @12:23AM (#30382419)
Yes counting calories is essential, I had very similar experience (walk 10 km on the weekend ~= burn 600 kcal, then buy a 1000 kcal snack on the way back and wonder why I'm not losing weight), but still the exercise makes a big difference.

Last year in march I started counting calories, recording my weight and all exercises I did and walking/biking every day.

I lost 30 kg, walked 2100 km, biked 1000 km, and the sum of calories burned by all exercise was about 160 000 which is about 20 kg of fat loss, so naively the remaining 10 kg was diet. Of course you cannot divide it like that - if I wasn't counting calories I would eat the 20 kg back easily. But if I wasn't walking I wouldn't be able to restrict the calories as much. I've been eating on average 2000 kcal and had average deficit of about 500 kcal. Without exercise I would have to eat 1500 on average which for me feels much worse than 2000. Also walking helps for a lot of unrelated things.

Re:Scientist busts myths about how humans burn calories by rob74 on Friday February 18, 2022 @03:22AM (#30383357)
Congratulations! I would be happy to lose "only" 10 kg (hell, 5 kg would be good for a start), but since Covid and home office my weight has been (slowly, but steadily) going in the wrong direction. Yeah, you can and do burn calories by exercising, but it's depressing how little it is. And it's also depressing if I look at the graph that some 40 to 50 year olds seem to still have the metabolism of a toddler - I'm definitely not one of those! OTOH, you can feel superior by thinking these people would be in big trouble if there was a famine, but that's (fortunately) not the world we live in (although it's pretty fucked up if you consider that we are complaining about these first world problems while in other countries people are starving)...
Re:Scientist busts myths about how humans burn calories by artdigital on Friday February 18, 2022 @04:01AM (#30383568)
My advise: (as someone who does a lot of working out and calorie control)

Write down what you eat for a while and its calories. Weigh yourself daily as well and write that down too. If after a week your weight went up: Your calories are above your TDEE. If it went down: Your calories are under your TDEE.

And that's basically it, once you know what your TDEE is, eat under it to create a caloric deficit and you will lose weight. Even if you don't exercise at all and just sit at home.

Sure exercise will help putting your caloric deficit lower by burning some, but in the end it's always calories vs TDEE. Understanding that makes it very easy to go in either direction (gain weight vs lose weight), no matter what your metabolism is

(The easy solution is of course to just eat less, like skipping a meal or reducing the amount. Since your average daily food is already what dictates your current weight, reducing it means you will lose weight)

Re:Scientist busts myths about how humans burn calories by AnIdiotOnTheNet on Friday February 18, 2022 @09:05AM (#30385771)
> Write down what you eat for a while and its calories. Weigh yourself daily as well and write that down too. If after a week your weight went up: Your calories are above your TDEE. If it went down: Your calories are under your TDEE.

Not necessarily. It is important to remember that water weighs ~1lb/pt and there are a lot of things that affect how much water your body is carrying at any given moment. Depending on your body mass, it is not unrealistic to see 5lbs of fluctuation in a single day. On a calorie restricted diet your body will tend to retain water (because it does this for pretty much any stressor), so you may actually see a slight increase in body weight at first even though your TDEE is above your caloric intake.

A more reliable approach, in my opinion, is to do the TDEE calculation for your target weight and set that as your calorie limit.

Re:Scientist busts myths about how humans burn calories by Tenoke on Friday February 18, 2022 @09:50AM (#30386407)
That's why they are telling you (as is common) to compare the results on a weekly basis which reduces the variance. TDEE calculations from scratch are much much more unreliable than empirically finding out and mostly good for a starting point.
Re:Scientist busts myths about how humans burn calories by artdigital on Friday February 18, 2022 @12:12PM (#30388340)
Yes, that’s why I suggested weekly

You can of course calculate the TDEE of your target weight but like you implied, unless you know your own, based on your own metabolism and intake, the data is never going to be accurate

For example I eat much less than my bodybuilder friends. When I went with the calories that they recommended to me I gained so much fat with a very active workout schedule and noone had a explanation why. Maybe it’s hormones, maybe medicine I take, maybe something else. I now eat much less than you’d expect from a person with my height and age, but I still gain weight, because my actual calculated TDEE is comparatively low

Having that data on hand as a reference is incredibly helpful to plan my weight progress

Re:Scientist busts myths about how humans burn calories by mrleinad on Friday February 18, 2022 @09:45AM (#30386321)
I'd love to count calories. I'm just too lazy to measure and research everything I eat, and the alternative is to have only processed foods that are labeled.

It's too bad that we can't just live on Soylent (the actual beverage, not the thing from the book)

Re:Scientist busts myths about how humans burn calories by xzel on Friday February 18, 2022 @10:40AM (#30387130)
With a 10 dollar scale and an App like Lose It, it is pretty easy. They have both things with UPC codes for easy look up and standard foods, for example brown rice or salmon. I keep track and probably spend less than 5 minutes a day getting everything down. Obviously it will be difficult at a restaurant unless you want to bring a scale with you or beg the wait staff but largely they won't mind and if you're order grilled chicken and veg most likely they won't mind measuring the chicken for you. Anyways, the stuff on labels are estimates so the whole process has some moderate error so as long as you estimate fairly you don't have to worry about being crazy accurate.
Re:Scientist busts myths about how humans burn calories by wrekone on Friday February 18, 2022 @03:01PM (#30390347)
A few years back I lost 30 lbs over the course of a year using Lose It. I didn't make any major dietary changes other than reducing total caloric intake. I found that ballpark estimating calories for restaurant food was fairly easy and close enough. I never weighed my food. I even went over my caloric budget fairly often and would just make up for it the next day. Overall, it was surprisingly simple to lose the weight but I did find myself hungry more often than I would have liked. After regaining that weight over the last two years, I recently bought an exercise bike. I'm hoping that the regular exercise it provides will help suppress my appetite. I have been thinking about picking up Lose It again, and this thread has convinced me.
Re:Scientist busts myths about how humans burn calories by raffraffraff on Saturday February 19, 2022 @04:42AM (#30395731)
I dunno, me and the wife realised that certain foods are simply not worth the calorie count. Really nice curry vs Pizza? The curry wins on taste, nutrition and calories. Chocolate bar vs chocolate-chip brioche? If I'm honest, id prefer the brioche (warmed a little, with a cup of decent coffee). It also affected ingredient choices: if I'm gonna make an Indian dish like palak paneer, I find it impossible to get low-fat paneer. However I can get low-fat halloumi (lots of protein), and if it's cooked right, it works extremely well in place of paneer. Over 6 months using a calorie counting app we got to our "perfect weight" without having to go hungry. In fact, if anything, it just made me stop and think before having second helpings and overeating. So now we have "free meals" in the freezer, for when we want a lazy evening.

On the low fat halloumi vs paneer thing... We also found that low-fat soft cheese (like Philadelphia light) are amazing in soups. Simmer lentils and cubed potatoes with some spices and a can of chopped tomatoes, and just before you serve, add a large dollop of light Philadelphia and stir it all the way in. Boosts the protein content and makes for a really creamy soup. Also works great in other soups.

Re:Scientist busts myths about how humans burn calories by wrekone on Saturday February 19, 2022 @01:04PM (#30399064)
Absolutely. Preventing overeating was likely the biggest contributor to my weight loss. I stopped going back for seconds every time. The next biggest was probably eating higher quality foods, similar to your examples. My memory is fuzzy on this detail, but I believe the times I ended up hungry were largely the days on which I'd had an especially calorie dense meal, like pizza, earlier in the day, so my calorie allowance was smaller come dinner time. However, pizza being my favorite food, I'm unlikely to give it up. Rather, I try to make it the last meal of the day. I found that I was able to resist the late-night munchies easier than mid-day hunger pangs.
Re:Scientist busts myths about how humans burn calories by raffraffraff on Sunday February 20, 2022 @06:49PM (#30410402)
I'm trying to figure out if it's possible to make a healthy pizza. Adding gluten to the flour for extra protein, using low fat cheeses etc. If I crack the 500 calorie 12" pizza I'll let you know.

https://m.youtube.com/watch?v=0MpL1KfYEJg

Re:Scientist busts myths about how humans burn calories by fmajid on Monday February 21, 2022 @09:14AM (#30416071)
The Milton's brand cauliflower crust pizza (available at Costco among other places) is also pretty good. Not available outside the USA yet AFAIK, unfortunately.

Making the crust very thin is also an obvious way to reduce carbs, and using whole wheat crust also help, and using Khorasan wheat or similar whole grains.

For sweets, I adopted the snob diet: raise your standards so much the average supermarket chocolate bar just doesn't appeal any more, and you are less likely to snack casually :-)

Re:Scientist busts myths about how humans burn calories by raffraffraff on Friday March 04, 2022 @05:51AM (#30553045)
Never had a decent cauliflower crust (yet). Unfortunately the Milton brand isn't available where I am. But checking out the nutritional value, they're replacing replacing wheat flour with "Rice Flour, Tapioca Starch", which smacks of gluten free rather than low carb. Having said that, it is lower in calories than my store bought pizza (690 vs 800 for the same weight). But is it as good? Like your snob chocolate diet: I would prefer to eat pizza less often and maybe walk an extra 5km on the days that I enjoy a real pizza.

I am going to experiment with low-flour dough with extra gluten and cauliflower to bulk it out. Might need xanthan gum and an egg.

Re:Scientist busts myths about how humans burn calories by pessimizer on Friday February 18, 2022 @11:22AM (#30387688)
If you eat a lot of similar stuff, after looking up things periodically over time you'll get to be able to ballpark calorie counts. Calories aren't really hidden that well.
Re:Scientist busts myths about how humans burn calories by jnsie on Friday February 18, 2022 @10:34AM (#30387041)
I was very excited about Soylent years ago...until I tried it. I really disliked the flavor, so wouldn't have stuck with it regardless, but what really surprised me was how much I enjoy the act of sitting down and eating a meal. Soylent filled me up, but it never satiated me. Regardless of the time savings and predictability, I missed the act of eating, if that makes sense.
Re:Scientist busts myths about how humans burn calories by bavell on Friday February 18, 2022 @12:48PM (#30388787)
Makes total sense to me - we are creatures of habit and eating is one of our most sacred rituals. It's deeply rooted in our psychology so no surprise to me that one would miss the ritual even if satiated.
Re:Scientist busts myths about how humans burn calories by mrleinad on Saturday February 19, 2022 @07:44PM (#30402044)
I tried it while on a trip to the states, and had the same experience as you. It was barely ok, and the taste was not great. Also, saved time from not eating a regular meal is not that much, cooking it is. As with many things, that can be fixed just by throwing more money at it.
Re:Scientist busts myths about how humans burn calories by etc_etc on Friday February 18, 2022 @10:43AM (#30387173)
MyFitnessPal does a pretty good job. You can scan barcodes and it'll (usually) have the calories and macros. Also just having a set of scales on hand makes it a lot more accurate!
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @11:36AM (#30387862)
When you cook for yourself it's pretty easy. After a month you remember kcal per 100g for each common ingredient and the weight is on the box or on the receipt anyway.
Re:Scientist busts myths about how humans burn calories by andyjohnson0 on Friday February 18, 2022 @04:41AM (#30383831)
TDEE = Total Daily Energy Expenditure
Re:Scientist busts myths about how humans burn calories by wcrossbow on Friday February 18, 2022 @04:44AM (#30383847)
For me at least it's not that simple. My weight (healthy to low BMI) has been very stable over many years with vastly different amounts of exercising and quality of eating habits within that period. Fat to muscle ratio does move but total weight is stuck even with long runs of lots of junk food.
Re:Scientist busts myths about how humans burn calories by artdigital on Friday February 18, 2022 @05:32AM (#30384128)
Hmm I have trouble believing that. If you eat less and put yourself into a caloric deficit, your body is going to start using up fat and to a certain degree muscle, that's just how it works and your body is no exception. If you work out during a deficit, your body will try to retain muscle and use more fat instead. Gaining muscle in a deficit is possible, but only in small amounts, if at all.

> quality of eating habits within that period

To me this sounds like you aren't actually changing the amount of calories that you eat, just the quality of them. Eating 2000 calories of McDonalds or 2000 calories of high quality food does not matter (or barely matters) for losing/gaining weight. If 2000 calories is under your TDEE, you can eat 2000 calories of cheesecake and would still lose weight (but very unhealthy).

What I see often is people claiming stuff like "I can't lose weight" or "I have a slow metabolism", but they never actually bother counting how much they eat, and because of that have no understanding of what high-calorie and low-calorie food is. (For example if I'd ask how much calories an average hamburger or a glass of cola has, you'd likely have no idea if you haven't counted calories before).

It was the same for me, once I started counting I realized that I was not eating according to the goals I had set at that time, and that the food I ate was actually much much less in calories than I thought it was.

Re:Scientist busts myths about how humans burn calories by curiousllama on Friday February 18, 2022 @08:06AM (#30385232)
The key is “fat to muscle ratio”

It’s a body recomp from an untrained person. Pretty common for new lifters.

You’re right though - if they lift better and eat better, that’ll change.

Re:Scientist busts myths about how humans burn calories by rob74 on Friday February 18, 2022 @04:28AM (#30383757)
Of course, eating less is the ideal solution if you can muster the willpower to actually do it - but that's a big "if" for many people...
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @04:40AM (#30383822)
Counting calories is still very useful, because you learn what's "worth it".

For example there are protein bars that are supposedly healthy, but they have 150-250 kcal per 50g bar.

On the other hand there are these watery ice creams that have about 65 kcal per piece and feel just as indulgent if not more.

Other things that are very much "not worth it" on the enjoyement/kcal scale is bread and other pastries.

2 buns with ham is 500 kcal and feels like nothing. A whole pan of hot vegetables with some meat is +- the same and feels like a proper dinner.

Re:Scientist busts myths about how humans burn calories by discordianfish on Friday February 18, 2022 @05:37AM (#30384159)
> these watery ice creams that have about 65 kcal per piece and feel just as indulgent if not more.

that shows why it’s easier for some than for others :)

Re:Scientist busts myths about how humans burn calories by ddorian43 on Friday February 18, 2022 @09:06AM (#30385789)
Just do keto diet or carnivore then. Will be a lot easier. You have to give up the cake.
Re:Scientist busts myths about how humans burn calories by pre63 on Saturday February 19, 2022 @02:43PM (#30399862)
I came here for this.
Re:Scientist busts myths about how humans burn calories by dan00 on Friday February 18, 2022 @09:07AM (#30385795)
You might try an other diet that‘s more filling and creates less cravings. So less carbs and more protein and fat. I don‘t think that willpower really works in this regard long term. It only creates frustrations.
Re:Scientist busts myths about how humans burn calories by dahart on Saturday February 19, 2022 @11:54AM (#30398479)
The big trick is figuring out mentally how to eat less without requiring willpower. It is possible. Depending on willpower is setting up for likely failure, IMO.
Re:Scientist busts myths about how humans burn calories by amelius on Friday February 18, 2022 @09:49AM (#30386387)
> I would be happy to lose "only" 10 kg (hell, 5 kg would be good for a start), but since Covid and home office my weight has been (slowly, but steadily) going in the wrong direction. Yeah, you can and do burn calories by exercising, but it's depressing how little it is.

Had the same problem. Then switched to intermittent fasting. First two months, nothing happened. Then within a month dropped 10 kg, which got me back to my pre-covid weight. I'm doing 8/16 IF by the way, and eating more than I did before, so I think the CICO theory is stupid :)

Re:Scientist busts myths about how humans burn calories by dahart on Friday February 18, 2022 @01:04PM (#30389002)
Isn’t 2.5kg / week weight loss extreme, and unhealthy or bordering impossible? It seems to be usually recommended to stay below 1kg per week, a healthy rate seems to be closer to 0.5kg/week. I’d assume that something might have been happening the first two months. Could be a measurement problem as well, that you were catching water-weight highs and then maybe changed the timing of your measurements? If you were actually losing closer to 0.8kg / week without knowing it for three months, that’d be about 10kg.

How much more are you eating exactly? Have you changed your exercise routine or physical habits? The problem with calling CICO stupid is that it’s two-thirds physics. The only way to gain mass is to eat it, and the only way to lose mass is to burn it off through RMR and exercise. There’s mountains of data demonstrating that humans gain weight when eating more than they burn, and lose it when burning more than they eat. The people who seem to lose/gain weight abnormally are just people who’s bodies burn calories in unusual ways. That’s rare and statistically unlikely, but even that still follows CICO.

Re:Scientist busts myths about how humans burn calories by wbsss4412 on Friday February 18, 2022 @11:40AM (#30387913)
An important thing to keep in mind is that a substantial amount of calories can be burned outside of formal exercise. Incorporating more walking into your day, general activities that involve movement rather than sitting at a desk, etc
Re:Scientist busts myths about how humans burn calories by lowercased on Friday February 18, 2022 @09:54AM (#30386465)
I've struggled with this a lot over the past 10 years. I was 60lbs (27kg) over my weight from leaving university 25 years earlier, I sit a lot, and am late forties. The last few years have been harder, and I've been bouncing between a small range, and couldn't 'break out'.

Others have suggested 'writing it down' - not going to argue with that. I don't 'write down' every food I eat, but I do make mental notes every day. What's helped me more though...

2 years ago I bought a fitbit - basic model, nothing fancy, but got serious about tracking my movements. It helped create some easier external documentation about what I was doing. I then moved to an Apple Watch last May, and have been following the '3 circles'. It gave me a target 'move X calories per day' target, do X minutes of 'exercise' every day (exercise seemingly defined as 'get your heart rate above Xbpm').

I've hit those targets ALMOST every day (I missed one calorie target 1 day by 13!). I'm on day ... 206 of my movement streak.

For me, the visual reminders on my wrist help keep me motivated/focused. I 'compete' against a couple of friends with the watch now and then, but just being connected and getting a thumbs up from a friend now and then is motivating.

As others said, track weight daily - I track morning and night. I put it in my iphone. I look at the graphs. I see the downward trend. THIS HELPS A LOT when it bounces back up a bit now and then. I'm up ... around 1.5 lbs from earlier this week. JUST seeing that uptick used to demotivate me. But looking at the downward trend of the last 7 months, I can see the larger direction is down, and I don't stress as much about small upticks. I'm down 25lbs (11kg) from last June, and at this pace will probably be down another 15 or so by this year.

I used to go to a gym, but ... it's a 'process'. I now often just go outside and jog around. There's a run club once per week, and weather permitting, I'll do it, but... I hit those targets every day. Even if it's just running in place, or getting on an exercise bike, or jumping rope. I tell myself "every little bit helps", and tracking every one of those 'little bits' has been the motivating factor for me. May be different for others, but keep going till you find something that works for you.

Took me years to find some 'thing' that clicked for me, but I'm closing in on one year of losing weight based on 'more movement' and 'fewer snacks' and 'better eating'. But it took weeks before there was a trendline to see a downward line.

Re:Scientist busts myths about how humans burn calories by y4mi on Friday February 18, 2022 @01:55AM (#30382875)
And yet the article you're commenting on says that you don't burn more calories by exercising... If it is true, it definitely changes the narrative.
Re:Scientist busts myths about how humans burn calories by Elte on Friday February 18, 2022 @02:50AM (#30383167)
I'm a bit confused by this point in the article, because it also states:

> There seems to be a hard limit on how many calories our bodies can burn per day, set by how fast we can digest food and turn it into energy. He calculates that the ceiling for an 85-kilogram man would be about 4650 calories per day.

Given that "regular" people clearly do not burn 4650 calories per day, and it is possible to burn 4650 calories per day, there must be a point at which exercise _does_ increase energy expenditure. I'm guessing it just doesn't happen for regular doses of exercise (including, evidently, walking 14km per day).

Perhaps the body down regulates calorie-consuming processes to a point where it's just the bare minimum, and calorie expenditure increases from there. Or perhaps we should take the opposite view and say that our bodies up regulate unwanted processes (like inflammation) to use the energy of an engine designed to keep running at a certain level?

Either way I find this incredibly interesting. And either way I'm probably also going to keep stuffing my face on a day I run 30km :).

Re:Scientist busts myths about how humans burn calories by tempestn on Friday February 18, 2022 @04:18AM (#30383701)
Yeah, the article isn't very clear on this. ISTM the claim is not that exercise doesn't increase energy consumption at all, but just that it increases it by much less than the amount of energy expended in the exercise, because the body (partially) compensates elsewhere. Whether the degree of compensation varies based on amount of exercise I'm not sure, and I wish it had explained. I expect it probably would, as presumably there would only be so much 'low hanging fruit' for your body to use when compensating.
Re:Scientist busts myths about how humans burn calories by alistairSH on Friday February 18, 2022 @09:27AM (#30386059)
I can definitely see how that works. I'm a cyclist and often ride 60-100 miles on a weekend day, plus 3 days pf 20-30 miles during the week. That should be a lot of extra calories. But, after those long rides, I usually need a nap and don't do much else (maybe grocery shopping, but definitely not woodworking or other serious projects).

That said, at the peak of my training (12 hours/week), I can definitely consume more calories without putting on weight. Like, a giant bowl of ice cream most nights. But, if I continue that diet during recovery periods, I'll put on a few pounds. So, it's not that exercise has zero impact, but possibly quite a bit smaller an impact that one might assume.

Re:Scientist busts myths about how humans burn calories by hgomersall on Friday February 18, 2022 @04:13AM (#30383658)
Yeah, I thought this. There's clearly an amount of exercise that will cause you to lose weight. An interesting question is whether your body prevents you from achieving that.

Cycling was always interesting to me in this context because it seems easier to burn energy on a bike than other forms of exercise.

Re:Scientist busts myths about how humans burn calories by alistairSH on Friday February 18, 2022 @09:30AM (#30386103)
seems easier to burn energy on a bike than other forms of exercise

I'm not sure this is true. Cycling isn't weight-bearing (you're sitting down) and only engages the large leg muscles. Running and rowing likely provide more calorie burn for a given RPE (rate of perceived exertion) over a fixed time period. Running because it's weight-bearing; rowing because it engages more muscle groups. That said, you can probably cycle for more hours total, if you have nothing else to do.

Re:Scientist busts myths about how humans burn calories by naasking on Friday February 18, 2022 @10:30AM (#30386979)
Running doesn't burn as much as you think because your muscles store energy elastically on the eccentric phase of each step. This removes a lot of energy needed for the subsequent concentric part.

Contrast this with cycling which is pretty much all concentric contractions.

Re:Scientist busts myths about how humans burn calories by alistairSH on Friday February 18, 2022 @10:36AM (#30387071)
Interesting, hadn't considered that aspect. Just goes to show how complicated and counter-intuitive this can be.
Re:Scientist busts myths about how humans burn calories by naasking on Friday February 18, 2022 @01:41PM (#30389439)
Evolution is great at optimizing! Running is so efficient for humans that some human tribes use it to hunt (persistence hunting). They literally run their prey to exhaustion then just walk up and kill them.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @04:27AM (#30383751)
When cycling there's this "wall" you hit after a few hours. At least I do. After that it's much harder to keep pace or go uphill.
Re:Scientist busts myths about how humans burn calories by nradov on Friday February 18, 2022 @12:44PM (#30388725)
There's nothing special about cycling. You can deplete your glycogen stores and hit the wall with any aerobic activity. If you have a healthy metabolism and stay in heart rate zones 1-2 then you'll mostly burn fat stores and can cycle for many hours without hitting the wall. At higher zone 3+ efforts you'll need periodic carbohydrate supplements to keep going.
Re:Scientist busts myths about how humans burn calories by hgomersall on Friday February 18, 2022 @07:32AM (#30384925)
Indeed, but you can keep going just about. I've properly hit the wall once, and that was an unpleasant experience - nearly fainting and seriously in danger of falling off my bike, but I think that was largely a hard removal of all accessible glycogen, and it was years ago when I was relatively green. Now I just tend to eventually find it hard and unpleasant.
Re:Scientist busts myths about how humans burn calories by throwawayboise on Friday February 18, 2022 @11:54AM (#30388116)
> there must be a point at which exercise _does_ increase energy expenditure

Of course there is. The problem is that it's much easier to eat than it is to exercise. You can eat a Big Mac in 5 minutes, and you'd have to run or bike for hours to burn those calories off. A 30 minute jog on a treadmill won't do it.

Most people eat more calories than they need, and would have to exercise much more than they realize to burn them off. So losing weight over a reasonably short period of time almost always requires cutting calories. Few people have enough free time to do it with exercise alone.

Re:Scientist busts myths about how humans burn calories by noogle on Saturday February 19, 2022 @09:41AM (#30397440)
The efficiency of our bodies (or the amount of calories in food) is astounding. Makes one think whether there is any acceptable use case for serving snacks and other high-calorie-density food.
Re:Scientist busts myths about how humans burn calories by aixi on Friday February 18, 2022 @03:57AM (#30383554)
out of context, that quote is really funny; what happens once you reach 4650 calories? you start violating the rules of thermodynamics?

(i know your body starts compensating for it and burning less calories, but still)

Re:Scientist busts myths about how humans burn calories by KronisLV on Friday February 18, 2022 @04:06AM (#30383603)
> what happens once you reach 4650 calories?

Well, we probably need to look at the direct quote again.

> There seems to be a hard limit on how many calories our bodies can burn per day, set by how fast we can digest food and turn it into energy.

Maybe i'm reading this wrong, but if one's body were to burn calories at 100% of this supposed possible rate, then by the time you'd reach 4650, a new day would start.

If digestion would top out at 4650 calories at day, with 24 hours per day, it would come down to 193.75 calories per hour. Or, in other words, it'd be about 3.23 calories per minute.

Re:Scientist busts myths about how humans burn calories by dahart on Friday February 18, 2022 @10:28AM (#30386946)
> what happens once you reach 4560 calories?

There are loads of videos on YouTube of what happens. You may or may not want to watch them. Spoiler alert: you vomit when you eat too much.

The vomit limit is probably higher than 4560 (which BTW has a suspicious number of significant digits), there might be a range between too many calories and vomiting where your body breaks down the food into waste without digesting any more nutrients/calories. Kinda like how if you eat too much vitamin C, you’ll just pee most of it out.

Re:Scientist busts myths about how humans burn calories by InitialLastName on Friday February 18, 2022 @10:22AM (#30386846)
At some point your body will also fail to exert energy; there are also metabolic safeguards ahead of the point where your body can no longer manage the energy to keep basic functions going where the lower-priority functions (immune system, cognitive function, motion muscles) start to degrade.

You don't need to be at the limit of human energy intake to see what happens to people when their energy expenditure greatly exceeds the energy available from food over a sustained time period; there is quite a lot of medical literature on the effects of such... er... malnutrition.

Re:Scientist busts myths about how humans burn calories by tempestn on Friday February 18, 2022 @04:16AM (#30383681)
Long term, yes. Short term you might be able to get some from fat stores. But the claim is that ~4650 is the most you can persistently get from food intake per day.
Re:Scientist busts myths about how humans burn calories by Peeda on Saturday February 19, 2022 @01:11AM (#30394800)
Sort of makes sense, the body is a machine and will get worn down/depleted at some point and not some infinite bag of holding. Surprised its as low at 4650 calories though, figured marathoners + swimmers and such could burn more.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @02:12AM (#30382951)
The article says you can't keep unhealthy diet and get fit just by exercising. Which is true in my experience as well - I was eating over 3000 kcal a day before I started counting calories, and if I haven't reduced that - no reasonable amount of exercise would have helped.

What's tricky is that in early 20s I was eating about as much and it was fine.

Re:Scientist busts myths about how humans burn calories by nradov on Friday February 18, 2022 @01:06PM (#30389023)
There's a huge variation between individuals based on size, sex, and activity level. As a large, fairly active man I have to consume around 3100 kcal per day just to maintain body weight. But a small, sedentary woman might gain weight with even half that consumption.

All else being equal, resting metabolic rate doesn't tend to slow down much as we age. The notion that people in their 20s can eat as they want without gaining weight is mostly a myth. It's more likely that you don't accurately remember what you consumed and your activity level in your early 20s.

Re:Scientist busts myths about how humans burn calories by ewindal on Friday February 18, 2022 @02:09AM (#30382941)
You’re reading that wrong. Of course you burn more calories through exercise. Michael Phelps couldn’t have eaten 12k cals a day if exercise didn’t burn calories.
Re:Scientist busts myths about how humans burn calories by csee on Friday February 18, 2022 @02:50AM (#30383166)
Well that's what the article says. The Hazda who walk 8-12 km a day burn the less calories as an average American (or the same after adjusting for body weight).

Also that Phelps thing is highly questionable. He says he "probably" burns 8-10k, not 12k. Not the type of statement you want to rely on to dismiss all this work.

Re:Scientist busts myths about how humans burn calories by skohan on Friday February 18, 2022 @04:03AM (#30383590)
I just have a hard time believing it to be true that no amount of exercise will increase the overall caloric expenditure. For example, I've done a few multi-week bike tours, and we ate an enormous amount of mostly pasta every day, and managed to peel off a few pounds each by the end of it.
Re:Scientist busts myths about how humans burn calories by e12e on Friday February 18, 2022 @06:32AM (#30384472)
It's strange. Go out in freezing weather and stand still;you'll get cold. Move about and you get warm. I find it unlikely that you can heat up without energy?
Re:Scientist busts myths about how humans burn calories by csee on Friday February 18, 2022 @04:17AM (#30383686)
The article mentions a study that tracked energy expenditure of runners over many weeks, and found that the energy expenditure was much lower at the tail end of the experiment, suggesting the body gets accustomed to the activity somehow and burns less energy.
Re:Scientist busts myths about how humans burn calories by uberduper on Friday February 18, 2022 @10:11AM (#30386704)
The study must have tracked non-runners, given the conclusion. If they were already runners and the conclusion is that they get accustomed to the activity, they'd already be accustomed and there'd be no tail end difference. So they most likely tested non-runners and had them start running. We get more efficient at physical exertion with practice. Better coordination of muscle groups. Finding a more efficient pace. Correcting form deficiencies. These all increase capability or reduce energy expenditure.
Re:Scientist busts myths about how humans burn calories by csee on Friday February 18, 2022 @11:15AM (#30387583)
This assumes that there isn't a spectrum of running intensity. In this case they were running 10s of kilometres every day during the study, an absurd distance. So they were likely experienced runners already who were engaging in this extreme competition and took it up to an abnormal intensity that they weren't used to.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @04:30AM (#30383764)
Well one obvious adaptation is losing fat = less energy needed to move the body.
Re:Scientist busts myths about how humans burn calories by csee on Friday February 18, 2022 @04:40AM (#30383821)
We saw a very large reduction in caloric expenditure in people who were already very fit runners. So body weight changes over the course of the experiment are unlikely to explain it.
Re:Scientist busts myths about how humans burn calories by magicalhippo on Friday February 18, 2022 @09:33AM (#30386138)
So if they just kept doing the experiment they would end up not needing to eat?

Clearly there are some details that matter here...

Re:Scientist busts myths about how humans burn calories by necovek on Friday February 18, 2022 @09:45AM (#30386323)
And in most places in the article calorie expenditure is taken as "corrected for no-fat weight".
Re:Scientist busts myths about how humans burn calories by tsimionescu on Friday February 18, 2022 @03:52AM (#30383512)
The article says pretty explicitly that, while you do burn more calories while exercising, your body finds other ways to compensate and generally keeps about the same total energy expenditure in a day.

I'm pretty sure this doesn't apply to extreme cases like modern athletes, who explicitly push their bodies in many ways that normal fit people don't, and who have teams of doctors and coaches that can force them to keep up with exercise and diet even when their bodies are telling them to stop.

Re:Scientist busts myths about how humans burn calories by __MatrixMan__ on Friday February 18, 2022 @02:34AM (#30383070)
Is it certain that we absorb all of the calories we consume? I went on a backpacking trip with my friends recently and despite similar activity levels everybody was surprised when they noticed that I eat twice as much as anybody else in the group.

Maybe I should bring it up with a doctor, but I feel fine, I just also spend more on food than most.

Re:Scientist busts myths about how humans burn calories by Geee on Friday February 18, 2022 @02:56AM (#30383208)
No, there's lots of calories in stool, but it depends on the type of food. For example, eating lots of fats and oils tends to "go through". On the other hand, rate of metabolism varies between people too.
Re:Scientist busts myths about how humans burn calories by stormbrew on Friday February 18, 2022 @02:45AM (#30383139)
Yes, this. These conversations about weight loss are so rife with spherical cows and people come to ridiculous generalizations because of it. Bodies are complicated and varied. "Michael Phelps eats 12kcal a day and yet he's not fat" is just a correlation, it doesn't mean anything. He's an extreme outlier of a person in many ways.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @02:49AM (#30383161)
I was eating similarly in my 20s and 30s and in 20s I kept about 80kg but in 30s I got to 130kg :/

BTW there are diseases that reduce calories absorbed, you might want to get checked for colitis ulcerosa and crohn's disease. They have nasty side effects so better to know earlier even if you don't have the worst symptoms.

Re:Scientist busts myths about how humans burn calories by imtringued on Friday February 18, 2022 @03:33AM (#30383412)
The body absorbs refined carbs very quickly. The glucose rush will increase insulin levels to very high levels and make you feel hungry again soon leading to the consumption of even more calories.
Re:Scientist busts myths about how humans burn calories by tremon on Friday February 18, 2022 @08:09AM (#30385248)
Anecdotally, this has been my experience as well. I tend to think of my base metabolic rate as the integral over my physical activity over the last N years (it used to be N=5, but even that window is way too small I think now). Point being, you can be inactive for a long time without a meaningful change in body fat/weight, but eventually your body adjusts. Or rather, the first gain in body fat is offset by the loss of muscle weight. Once you're at a slower metabolic rate and less muscle, exercise becomes more difficult and it takes years of consistent activity to raise your metabolic rate again.

I'm not sure how base metabolic rate relates to incidental energy expenditure. My gut feeling is that every body has its own limits on energy expenditure, and max TDEE doesn't need to correlate directly with base metabolic rate. That's why I mentioned the integral above. I tend to think of $TDEE_{max} \simeq MBR_{base} + E_{available}$ but $MBR_{base} \simeq \int_{t=-5}^0 TEE(t)$ -- and in my experience, weight loss correlates more with base metabolic rate than with caloric intake ($E_{available}$).

Re:Scientist busts myths about how humans burn calories by dTal on Friday February 18, 2022 @03:59AM (#30383560)
What the heck kind of "snack" is 1000 kcal?
Re:Scientist busts myths about how humans burn calories by namdnay on Friday February 18, 2022 @04:36AM (#30383803)
A single cinnamon roll is nearly 500 calories. As soon as you’re combining fat and sugar things skyrocket
Re:Scientist busts myths about how humans burn calories by dTal on Friday February 18, 2022 @05:30AM (#30384115)
I would not class eating TWO cinnamon buns back to back as a "snack", but rather "a disgusting pig-out". Am I sheltered?
Re:Scientist busts myths about how humans burn calories by wccrawford on Friday February 18, 2022 @06:29AM (#30384455)
No, I think you have your head on right.

I used to eat a lot of candy, but I never considered eating more than a handful of anything a "snack".

That said, what do you call it when you eat something that isn't a meal? I don't think most people have any word other than "snack" without resorting to things that sound like insults, like "pig out". And it's really hard for most people to insult themselves.

Re:Scientist busts myths about how humans burn calories by namdnay on Friday February 18, 2022 @06:32AM (#30384468)
I’m not a big fan of sugar so I wouldn’t be able to eat a whole cinnamon roll, let alone two. But if I’m doing a big hike I’ll have no problem demolishing a whole tub of rillettes, which must be at least 1000kcal
Re:Scientist busts myths about how humans burn calories by AnIdiotOnTheNet on Friday February 18, 2022 @09:09AM (#30385818)
Maybe you're just not in a location where that sort of eating is common. Like the American south or midwest.
Re:Scientist busts myths about how humans burn calories by artdigital on Friday February 18, 2022 @04:02AM (#30383583)
Cinnabon comes to mind
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @04:43AM (#30383837)
In my case 2 buns with garlic butter. But any pastries will do.
Re:Scientist busts myths about how humans burn calories by stevetursi on Saturday February 19, 2022 @09:43AM (#30397453)
a slightly-larger-than-normal slice of pecan pie will easily get to 1000kcal. a la mode and you don't even need a normal sized slice.
Re:Scientist busts myths about how humans burn calories by toolslive on Friday February 18, 2022 @04:37AM (#30383808)
roughly 3/4 of your energy consumption is maintenance (fe keeping body temperature). So you walking/biking might even be irrelevant. If the outdoor temperature was low, this would probably be number 1.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @04:58AM (#30383929)
Standing still in -10C/-20C is pretty uncomfortable, but walking is perfectly fine and you even get hot after a while. So I'm not sure this is true.
Re:Scientist busts myths about how humans burn calories by toolslive on Friday February 18, 2022 @07:46AM (#30385058)
it's simple thermodynamics: your body needs to keep its temperature around 37C. It needs energy for this. Heat flows from high temperature (your body) to low temperature (surroundings) via the contact surface (naked skin) or via via (clothing,...) The energy that you lose via heat transfer needs to be compensated. You burn food, fat, tissue,.... (I'm not a biologist, so I can't tell you in what order this happens)

Just try to lower the heating in your house in the winter and run around in a t-shirt iso a pullover.

Re:Scientist busts myths about how humans burn calories by toolslive on Friday February 18, 2022 @07:53AM (#30385113)
If you don't believe it, just look up what the diet on a polar expedition looks like.
Re:Scientist busts myths about how humans burn calories by hdjjhhvvhga on Friday February 18, 2022 @03:45AM (#30383469)
> the sum of calories burned by all exercise was about 160 000

I believe you meant kilocalories

Re:Scientist busts myths about how humans burn calories by verytrivial on Friday February 18, 2022 @03:55AM (#30383526)
In the context of nutrition the word calories always means dietary calories, so the kilo- prefix is redundant unless discussing physics, or commenting on HN...Ooooh, ok.
Re:Scientist busts myths about how humans burn calories by hnbad on Friday February 18, 2022 @04:10AM (#30383635)
The practice of indicating kcals as "Calories" always seemed to be an American thing to me. I don't know how widespread this is outside the US but there are plenty of countries that use "kcal" in nutritional tables and such. People will still colloquially confuse calories and kilocalories a lot but that's largely due to bad translations (similar to mistranslating short billions).
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @04:15AM (#30383675)
In Poland you write "100 kcal" but say "100 kalorii" unless it's in scientific context.
Re:Scientist busts myths about how humans burn calories by saiya-jin on Friday February 18, 2022 @05:11AM (#30384024)
People everywhere mix those 2 regularly and nobody is confused. You don't say you go out for a run to burn some kilo calories and so on. Sometimes places like HN are needlessly pedantic
Re:Scientist busts myths about how humans burn calories by tremon on Friday February 18, 2022 @09:45AM (#30386319)
If someone explicitly writes "160 000" calories I'm going to assume they meant 160 kcal.
Re:Scientist busts myths about how humans burn calories by samatman on Friday February 18, 2022 @10:50AM (#30387256)
Can you show me a representative sample of places where English speakers refer to [unit of energy] burned by exercise and mean anything else other than kilocalories while saying anything else other than calories?

No, you can't, you're showing hypercorrection and lack of fluency.

Re:Scientist busts myths about how humans burn calories by hdjjhhvvhga on Friday February 18, 2022 @06:12PM (#30392453)
Actually, I noticed it because the OP wrote kcal in one place and calories in another and since they were using large units I had to read the sentence twice to make sure they meant the same thing. I don't have a problem with the fact that we have a unit that means something in one context and 1000xsomething in another as long we're consistent in naming (only calories or only kcal in the context of diet). And of course I didn't mean to be mean (no pun intended) to the OP - being consistent is good but this is such a minor thing that we could safely ignore and it won't affect our lives at all - now I even feel sorry I paid attention to that.
Re:Scientist busts myths about how humans burn calories by ajuc on Friday February 18, 2022 @03:59AM (#30383559)
Yes, sorry. kcal not cal.