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POPSCertain foods can help women of all ages stay fit, healthy Something for the ladies. "Just as your lifestyle changes in each decade, so do your nutritional needs," said Melina B. Jampolis, M.D., an internist and author of "The Busy Person's Guide to Permanent Weight Loss." "For example, a 20-something needs to take calcium and vitamin D for strong bones, while a woman in her 40s should eat plenty of lean protein to help maintain muscle mass."