The conventional wisdom according to the World Health Organization, about why we get fat is an energy imbalance between the calories consumed and the calories expended. So conventional wisdom is too much food, too little physical activity —> overeating (energy in > energy out) —> obesity and the obesity epidemic.
The thing is this is just a hypothesis that is not fundamentally true.
It's not true because studies going back a hundred years have found eating less doesn't work. There have been many populations that are obese and they have very little food to eat.
Another common belief that exercising more has bees shown in may clinical trials not to work.
So is there a hypothesis that actually works?
Discover what regulates fat accumulation. Watch Gary's presentation.
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