Dear EarthTalk: There seems to be a large selection of soy and other non-dairy milks out there today, even right in the dairy sections of major supermarkets. Why should I opt for soymilk over cow’s milk and how do I get the calcium I would lose? -- Barbara Conant, Tacoma, Washington

There is a lot of debate about whether or not cow’s milk is good—or appropriate—for people at all. On the plus side, it is a valuable source of protein, as well as calcium, necessary to help build bones and keep them strong...