6. Consume whole foods, not supplements. Strong evidence suggests that people who have high blood levels of certain nutrients—selenium, beta-carotene, vitamins C and E—age much better and have a slower rate of cognitive decline. Unfortunately, there's no evidence that taking pills with these nutrients provides those antiaging benefits. "There are more than 200 different carotenoids and 200 different flavonoids in a single tomato," points out Ferrucci, "and these chemicals can all have complex interactions that foster health beyond the single nutrients we know about like lycopene or vitamin C." Avoid nutrient-lacking white foods (breads, flour, sugar) and go for all those colorful fruits and vegetables and dark whole-grain breads and cereals with their host of hidden nutrients.