There is no arguing that milk is a good source of certain nutrients. The main nutrient milk contains is fat, since it is meant to provide lots of energy for a growing mammal. But what about calcium? On the one hand, we’ve been bombarded with government health messages telling us to drink milk because it is a good source of calcium for growing bones. On the other hand, it is weird that humans are the only animals who drink mmilk after infancy, and also that milk-loving Western countries have so much osteoporosis. Vegan advocates will quickly tell you that milk depletes calcium from the bones.