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Myths and Truths About Osteoporosis (Do high protein diets cause bone loss?)

The 1972 study comparing British vegetarians and omnivores calls for additional comment. Bone density determinations through absorptiometry or X-ray are highly subject to error26, especially in unblinded studies where researchers may be biased towards obtaining pre-determined results. Subjects were matched merely for age, height and sex, but not for body composition and dietary habits such as smoking and sugar, coffee and alcohol consumption. A group of omnivores that smokes, drinks and indulges in a calcium-poor diet of refined carbohydrates will naturally have more of a tendency to bone loss than a group of health-conscious lacto-ovo vegetarians who consume plenty of dairy products. (British vegetarians do, in fact, tend to be very health conscious, avoiding not only meat but also alcohol, cigarettes, coffee and soft drinks. Unlike American vegetarians, they understand the importance of calcium-rich whole dairy products in the diet and eat plentifully of milk, cheese, butter and eggs.) When researchers compare the effects of high-meat diets to normal diets in the same person, no adverse effects are found, even over extended periods of time.27

Individuals who find they do better on high meat diets need not, therefore, worry about osteoporosis, as long as their diet includes complementary animal fats, plenty of calcium and a variety of other properly prepared whole foods.