For years, women have been admonished to drink milk and eat yogurt so that they will have enough calcium to keep their bones strong. Calcium supplements have become big business, and foods like orange juice have been fortified with calcium.

How good is the science supporting all this calcium to fight bone loss? We talk with a medical writer and a top nutrition scientist about a different dietary approach to osteoporosis prevention.

Michael Castleman is a medical journalist and author of more than a dozen books. His latest, co-authored with Amy Joy Lanou, PhD, is Building Bone Vitality: A Revolutionary Diet Plan to Prevent Bone Loss and Reverse Osteoporosis.

Walter Willett, MD, DrPH, is Chairman of the Department of Nutrition and Frederick John Stare Professor of Epidemiology and Nutrition at Harvard University’s School of Public Health. The photo is of Dr. Willett.

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