`In that case now we know all this. We shouldn't have an obesity epidemic right? We know much more about calorie intake and expenditure than we knew 100 years ago. We are all the right weight right?
The fact is that you can force the yourself to loose weight this way, but doing it permanently is extremely hard, your metabolism adapts and slows down to compensate, you cannot do exercise, or maintain a diet you don't like for the rest of your life. We naturally try to conserve energy.
We have been counting calories for at least 30 years now. What we have been doing is clearly not working for the vast majority of people, it is time we took a look at it and found a better way. My personal belief (although not scientifically proven) is we should be designing walk -able communities, that exercise is just a part of life. And making healthy food more convenient and satisfying. A salad may even be tasty but not after eating did I think I was full.