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Raw food vegetarians have low bone mass

St. Louis, March 28, 2005 -- Vegetarians who don't cook their food have abnormally low bone mass, usually a sign of osteoporosis and increased fracture risk. But a research team at Washington University School of Medicine in St. Louis also found that raw food vegetarians have other biological markers indicating their bones, although light in weight, may be healthy.

The study, published in the March 28 issue of the Archives of Internal Medicine, was led by Luigi Fontana, M.D., Ph.D., research instructor in medicine in the Division of Geriatrics and Nutritional Science. Fontana and colleagues studied 18 strict raw food vegans ages of 33 to 85. All ate a diet that not only lacked animal products but also included only raw foods such as a wide variety of vegetables, fruits, nuts, seeds, sprouted grains and legumes, dressed with olive oil. They had been on this diet for an average of 3.6 years.

The researchers compared them to people who ate a more typical American diet, including refined carbohydrates, animal products and cooked food. The groups were matched according to age, sex and socioeconomic status. In both groups, Fontana's team measured body mass index, bone mass, bone mineral density, markers of bone turnover, levels of vitamin D and inflammatory markers such as C-reactive protein and insulin-like growth factor 1 (IGF-1).

Those on the raw food diet had lower body mass indices and significantly lower bone mass in important skeletal regions such as the hip and lumbar spine, sites where low bone mass often means osteoporosis and fracture risk. But they didn't have other biological markers that typically accompany osteoporosis.

"For example, it is clear from research that higher rates of bone turnover equate to higher risk of fracture," Fontana says. "But in these people, although their bone mass is low, their bone turnover rates are normal."

The raw food group also had less inflammation, indicated by low levels of C-react
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Contact: Jim Dryden
jdryden@wustl.edu
314-286-0110
Washington University School of Medicine
28-Mar-2005


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