The Shadow said:How isnt it...there are massive studies that specifically show that greater carb intakes lead to over ranging insulion release which specifically blunts any fat loss as long as blood sugar is elevated. That means that even on a less than maintenance cals...bodyfat cannot be burned.....
that is a pretty much accepted fact.
You're correct about the calories.
But linking a rise in American obesity to the change in types of calories consumed definitively rejects all other factors such as exercise whcih could also explain the phenomena.
Even economic perfromance can be tied to fluctuations in obesity among the population, as well as efforts at health awareness. Look at those cities who successfully campaigned to llower their rating as Americas most obese cities.