Approximately two-thirds of Americans are now classified as overweight or obese. Genetic predisposition to a hunter-gatherer or farmer-based metabolism may play a role.
Authors:
Edward Saltzman, M.D., is Academic Dean for Education at the Friedman School of Nutrition Science and Policy, Associate Professor at the School of Medicine, and scientist at the Energy Metabolism Laboratory in the Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA.