− Generally speaking, the more protein you eat, the more calcium you excrete. When protein is digested, the parts it is brocken down into are very acidic, and your body uses calcium to buffer them. That means whatever calcium you take in will be diverted to this task from building bone. And if there's not enough on hand, your body draws calcium ou of your bones to do the job. It then passes out of the body altogether in the urine. For every gram of meat protein you take in, count on an average of one milligram of calcium going out. So for a 4-ounce portion of chicken, say, you're losing nearly 100 milligrams of calcium.
Meat protein is more acidic during digestion than protein from fish, dairy products, beans, nuts, and seeds. They are made up of different amino acids with different levels and kinds of fatty acids. Not all fatty acids are bad: those in fish and nuts and seeds are the ones known as omega-3's and omega-6's, which have been proven to provide protection against heart disease. So the quality of the protein you take in makes all the difference because we all need protein. Exactly how much protein a body needs depends on, age, size, and overall diet and health.
So forget your very high protein diets if you want any chance of keeping your bones on your side for the long run. Limit the amount of meat you eat to 4 ounce a day or less (a piace the size of a deck of cards).
− Too much alcohol interferes with the absorption of calcium, and thus with bone growth. Alcohol also seems to damage bones directly, and autopsies of alcoholics have shown skeletons that look as if they were 40 years older than they actually were. 
− Studies suggest that calcium helps build your bones only if you are also exercising properly (and exercise may only help if you are also getting sufficient calcium). Getting regular exercise, in combination with getting enough calcium and vitamin D, can increase your height and cut your fracture risk by 30% or more.
