We found this information in an article from Times Magazine. The information used to be available free at the following link, but last time we checked it out you had to pay. Diets that are high in protein cause more calcium to be lost through the urine. Protein from animal products is much more likely to cause calcium loss than protein from plant foods. This may be one reason that vegetarians tend to have stronger bones than meat eaters.
Grapefruit has lots of health benefits.
Grapefruit contains a certain substance that is responsible for this. Instead of having a lot of grapefruits don't have more than a few a week and have oranges or other citrus fruit to replace the grapefruit.