The point of putting butter in your coffee is to extend your natural faste. The faste that you enter every night during sleep. It is done in tandem with also skipping breakfast on keto.

The reason you put butter in your coffee instead of a spoonful of say, sugar, is that fat takes a long time to digest and even a fairly small amount of it (a table spoon of butter in your coffee) takes a while to digest. During that time period your hunger sensation is suppressed.

Coffee also promotes weight loss because it speeds up your metabolism. The idea behind buttered coffee is fairly simple. Put enough fat in your coffee so that you don't get hungry and eat a meal and you help extend your natural faste - and your morning coffee helps speed up your metabolism.

http://paleonick.com/articles/Bullet-Proof-Coffee

There are good reasons for drinking buttered coffee even if you're deliberately trying to avoid weight loss i.e you are following a net neutral or net positive caloric intake diet. When you're fasting your body isn't spending energy digesting food which means less of your body's immediately available resources aren't spent digesting food.

Even if you're getting calories from your coffee it doesn't impact your weight loss because you're still eating less calories than your body needs to maintain the weight.

> Even if you're getting calories from your coffee it doesn't impact your weight loss because you're still eating less calories than your body needs to maintain the weight.

This is completely dependent on other factors. Weight loss is dependent on a hell of a lot of things in tandem. It is mathematically strictly better to say, drink only black coffee or sugar-free energy drinks in the morning. Caffeine is an appetite suppressant. The difference is that most people don't have the personal willpower to stick to the fasting without a few calories to help them along.

Weight loss in general is precisely mathematical in pacing and it will absolutely make you lose weight faster if you consume less calories.

This assumes calories are all equal and the best measuring stick. Do we know this to be a fact?

> The difference is that most people don't have the personal willpower to stick to the fasting without a few calories to help them along.

You are ignoring an important factor: If you don't have enough calories the body will switch to starvation mode, you'll have low energy, be cold, etc.

The net result is that, unless you are actually starving (which is bad for you), you'll actually lose less weight that way!

> If you don't have enough calories the body will switch to starvation mode

This is a myth which has been proved to be absolutely false. You are simply wrong if you are basing any conclusions at all of of this.

> proved to be absolutely false

I'm perfectly willing to be shown that I'm wrong, but I'll need more than just a sentence from you saying so.

You said "proved" - can you show me the proof?

Dr. Jason Fung has done extensive research and experiments on this topic including fasting. You can read his research in his book obesity code. Very eye opening.

A quick google search results in multiple well cited articles discussing it.

I'm sure it could also yield multiple well-cited articles on the other side as well. It would be much more helpful to actually provide some research that you stand behind.

Lyle McDonald: http://www.bodyrecomposition.com/research-review/meal-freque...

Probably the best and most researched article on this.

Bullet point 4 here: http://www.leangains.com/2010/10/top-ten-fasting-myths-debun... has an article reference.

Basically, you can certainly go into starvation mode, but not in any reasonable amount of time. Skipping meals or even fasting for a whole day will not cause "starvation mode". Prolonged calorie restriction can affect hormones like Leptin and affect energy expenditure.

Bear in mind that Lyle believed in "starvation mode" 10-17 years ago; I believe he mentions it in his first book. He was also a firm believer in strict caloric arithmetic and that microbiome didn't matter. His content is only as good as the current scientific literature is, and that has changed a lot in the past 20 years.

A quick Google search also shows several well cited articles supporting the flat earth theory.

why do you use the word faste? Does it mean something different from the usual word related to not eating, "fast"?

I've been reading about bulletproof coffee, and the more I read, the more unsure I am about it. I think the following article makes good points:

https://authoritynutrition.com/3-reasons-why-bulletproof-cof...

I guess it might seem specifically OK for people on Keto diets only, but still, it seems worrisome longterm.

Who says it's an addition of calories? For many people breakfast is just coffee with coconut oil and butter. It's not adding calories it's just consuming them at a different time. You're still going to be at a deficit at the end of the day.

For me it would be compared to just black coffee and no breakfast, so of course it would be additional calories if I force myself to drink coffee with butter in it.

In that case it probably doesn't make sense. Unless you find that adding it to your coffee allows you to not eat additional calories for a longer period of time.

I have said exactly that in the past. I was wrong! It turns out morning me doesn't have the willpower to truly stick to just coffee.

It's hard for me to explain why the "calories in, calories out" theory is incorrect in so far as it's not useful to structure your diet around to prevent getting fat.

Gary Taubes was the person who I learned from the most, many years ago about high fat, low carb diet, and I have been following his advice ever since, to great success.

He has MANY videos on the internet, here is a recent one:

https://www.youtube.com/watch?v=mA4a5fjMR74

His book "Why we get fat" is also a great, clearly written explanation of all this, and I highly advise you to look into the subject, with an open mind. You may be surprised.

Not all calories are the same. For example, body excretes excess dietary fat, but stores excess carbohydrates adding 4 times the amount of water to it. You can find the details in any Paleo Diet related site.

I prefer to stick to something published on pubmed.

People often have bullet-proof coffee (as it is called) as a meal replacement. Those calories make them full for a long time, as fat is very filling.

If you don't eat a lot of carbs, that means you need to eat fat during the day to replace it. Would you rather eat the butter raw, or with a cup of coffee?

Um, either is fine IMO :)

Yes, cutting all calories works best. Just don't eat anything at all.