Obesity is the consequence of growth seeking in the food production and distribution industry.

Market pressures ended up selecting a diet made of poisonous food that lies to your tastebuds and satiety center.

Can’t all these things also be explained by our increasingly sedentary lifestyle?

I see three problems with that explanation.

First, I'm not sure there's a strong case that our lifestyles today are any more sedentary than in, say, the 1970s (when obesity rates were around 12% rather than 30%). We had cars, transit, elevators, escalators, school buses, television, keyboards, etc. in the 1970s, while at the same time "going to the gym" was just not something that average people did on a regular basis. Even going jogging was mildly eccentric.

Second, this is looking at resting metabolic rates, not overall calorie expenditure, although there is probably some association between RMR and physical activity.

Which brings me to the third point, which is that you're just shifting the burden of answering question of "why are we fat?" to "why are we sedentary?". If we are in fact increasingly sedentary, it could be that an outside factor is causing both low RMR and sedentary behavior. Anecdotally, I (as a comparatively skinny person) have a lot harder time sitting still than some of my friends and acquaintances that struggle with their weight. They might consider spending a day in bed as a great way to recharge, whereas it is something I would only do if I were pretty miserably ill.

There‘s a pretty marked decline in the amount of walking and cycling done in society.

In 1969 48% of US kids walked to school; in 2011 it was 13%. http://guide.saferoutesinfo.org/introduction/the_decline_of_...

Public transit is actually great for walking since you are walking to and from a stop.

People have become so unused to children walking around unsupervised that it has become grounds to call child protective services.

I don't think any significant portion of the population is going to the gym regularly these days. There is definitely a fitness community, but most people just sit around and eat.

Almost certainly.

Modern “western” people spend a tremendous amount of time sitting - either in an office or a car - and are almost totally sedentary.

In fact, so sedentary that the mere act of walking is considered “exercise”.

Frankly, I’m surprised the mental and physical outcomes aren’t even worse.

They will be in the coming decades as the population ages. The direct and indirect effects of sitting all day long are going to be incredibly costly to the society, and the only reasonable policy would be to combat our car addiction by any means necessary – and this is even distegarding all the other disastrous externalities of widespread personal car use!

I kind of wonder how much of a role climate control has to play as well. Surely must have a role alongside straightforward inactivity.. until pretty recently, people would burn a lot of calories just regulating body temperature indoors. People with outdoor jobs/lifestyles obviously still do.

The amount of SAD probably would be worth exploring was well. That's some hibernation mimicking behavior.