What health conditions require special emphasis on calcium?

A lack of calcium leads to osteoporosis, among many other things, which is the condition of having brittle bones. When the body is deprived of calcium, it will take calcium from the bones by breaking them down. If the body continues to be deprived of calcium, the bones will not be rebuilt like they normally would. Instead they will just be broken down even further. When a person eats and drinks foods and liquids with the proper amount of calcium for their body, their body doesn't have to break the bones down for the calcium because it already has a sufficient supply.