I've actually come to believe that for the past few hundred years evolution has had little to no effect on the human race. In fact, for the last 100 years the more successful you are, the fewer children you'd have. And the closer to the poverty line you are, the more children you'd have.
Basically having children, became a pasttime for those who can't accomplish anything. And it's not attractive people breeding.
UNTIL THE LAST TWO GENERATIONS.
The last two generations 1st world countries have such an abundance of food, and fatty high calorie food at accessible costs that weight is determined by your education, discipline, and healthy lifestyle.
While it may not affect those who chunk up later in life, the early onset fatties will be effectively removed from the gene pool. So at the very least we should, as a race, develop an ability to either resist temptation, or be more physically fit.
Well it's something...
FOr the creationists out there.... just assume I'm the devil or something.