When the first food pyramid--an easy-to-digest graphical hierarchy of what we should be eating--was introduced in 1992, it seemed broad enough to cover everyone. Since then, however, variations have proliferated: pyramids just for children, for vegetarians, Southerners, Native Americans, Italians, Chinese, Indians, Mexicans and so on. Dietitians have created for us a virtual Nile Valley of nutrition.
They're not finished. And the newest monument, constructed by Tufts University's Human Nutrition Research Center on Aging, may be the most significant so far. It's designed for those who are 70 or older, but the authors point out that anyone 50 or older should...
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