75 percent?! I'll be in the 25% by 7 years from now I trust.
Actually, my theory is that obese people are, from an evolutionary standpoint, a more HIGHLY ADAPTIVE human model. That sounds weird but follow my simple deduction, as follows:
Obesity is a pretty recent phenomenon in the homo sapien species - less than 100 years old only. We all know the agriculture/industrial revolution first ended daily manula labor for all, and first made food readily available in high concentrations to the masses in about 1900, or even later, post-WWII for most folks. Before then, unless you were rich, you had to work your arse off for food most of the time, and manual labor, walking and physical exertion were everyday occurrences for just about everybody.
THEREFORE, in those common periods of caloric restriction - whether caused by famine, poverty, no proximity to food, whatever - the best adapted human models could store fat to ward off DEATH. Accordingly then, the very very recent phenomena of plenty of food and lack of exercise has not been adapted yet in homo sapiens - and those who are fattest are the most evolved.