Comment by gtt

>>Simple logic would suggest that our food is the main culprit.

Then, why does it happen in wild animals? They are not eating processed foods.

Even if the food is main culprit, it leads to the question of what is exactly wrong with the food?

p.s. we have enough data to understand overall historical trends and authors cite it:

https://voxeu.org/article/100-years-us-obesity