Ok...heres one:
The body cannot burn bodyfat with elevated insulin levels.
^^Thats a fact..
so...2000 cals of hogh GI carbs will greatly inpact blood sugar response, making it impossible to burn bodyfat during those spikes in insulin.
Protein, for example does not have this drastic of an effect.
SO...cals are not cals from a body performance, weight loss aspect.
If all cals are equal...explain why Americans ate a record low %age of fat in the diet last year and a high %age of carbs...yest obesity is at an all time high?