“The calcium in vegetable sources may prove more bioavailable (useful to the body) than the stuff you get from milk. One study compared the absorption of calcium from kale and from milk and found kale the clear winner. (Yeah, kale!) Recent studies have shown that plant-sourced calcium in particular increases bone-mineral density and reduces the risk of osteoporosis. This is probably not just due to the calcium content of the plant—the complement of other vitamins (such as vitamin K), minerals, and phytonutrients work synergistically to provide additional benefits to bones. Yet another reason to eat your greens.”