Almost all nutritional research seems inherently flawed to me only because it's so difficult to control the diets, lifestyles, and (obviously) genes of the stud

Almost all nutritional research seems inherently flawed to me only because it's so difficult to control the diets, lifestyles, and (obviously) genes of the study participants. The China Study makes some compelling arguments for avoiding "animal-based" foods, but of course, there are people like the Inuit, who don't exhibit high incidence of cancer and heart disease despite eating mostly animal-based foods. I try to take all this stuff with a grain of salt, but the idea of "Eat food. Not too much. Mostly plants." seems most sensible to me. And I'd probably add to that, "Get some exercise."