Current market trends suggest that cow's milk is falling out of favor, and some anti-dairy campaigns are gaining momentum. However, milk supporters note that it is an important source of calcium and may help prevent cancer. "Milk is one of the richest sources of calcium," said Dr. Judith Bryans, the director of the Dairy Council. "But it's not just calcium in milk that is useful -- milk and other dairy produce contains magnesium, protein and phosphorus, which are all bone-building nutrients."

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