It seems like nothing is as simple as it should be, even building healthy bones. It's true that eating right and exercising regularly starting early in life can keep your bones healthy and prevent osteoporosis, but it's also true that you can overdo it. If you diet too severely while exercising too rigorously you can actually make it harder for your body to form new bone, instead of easier. Which means when you're older your bones will be weaker.

It's all about balance. Exercise is great for bones, but only if you eat enough to provide the fuel your body needs. What you don't want to do is run yourself into the ground, because even if you don't have major symptoms now you'll end up paying for it later.