Bones may become brittle and weak as you age. But getting enough calcium can help protect your bones and keep them strong. There are plenty of good sources of calcium. Dairy products, such as low-fat milk, yogurt, and cheese, are a good source. So are almonds and beans. And so are dark green, leafy vegetables, like collard greens, kale, and spinach. Be sure to talk with your doctor about the right amount of calcium for you.