Reply #9: Meat (high protein) causes more calcium loss

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Boning up on Calcium and Osteoporosis

Since the 1920's researchers have known that diets that are high in protein, especially animal protein, cause calcium to be lost through the urine.1 In nations with high rates of osteoporosis, protein intake is generally high~usually more than twice the U.S. Recommended Daily Allowance. Vegetarians have lower rates of osteoporosis than meat eaters. This may be due to the lower protein intake of vegetarians. Different types of protein also affect this loss. Meats are overly high in protein and are high in a particular kind of protein building block, called sulfur- containing amino acids. These cause increased calcium loss.

http://articles.animalconcerns.org/ar-voices/archive/calcium.html

Meat 'bad for bone health'

Vegetable proteins could be good for bones

Elderly women who get too much protein from animal products like meat and cheese risk fractures and bone loss, researchers are warning.
They say women can improve their bone health by using vegetables as a greater source of protein.

In a study, women who got a high ratio of their protein from meat or dairy products rather than vegetables, had three times the rate of bone loss than those at opposite end of the scale.

http://news.bbc.co.uk/1/hi/health/1083066.stm