The obesity epidemic in the U.S. continues. In the last few years, obesity rates have not increased significantly in some U.S. subpopulations, but it is too soon to tell whether this means that the epidemic has reached maximum levels in these populations.1, 2 There is clear evidence that obesity rates are increasing in much of the rest of the world.3, 4 A large amount of research is now directed toward better understanding and treating obesity, and substantial public health efforts are directed toward reducing obesity rates. To date, however, there is little evidence of success in reversing the epidemic in the U.S.