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High Animal Protein Intake May Increase Risk of Bone Loss.
2001 JAN 18 - (NewsRx.com) -- A University of California at San Francisco (UCSF) study finds elderly women who get a much higher intake of their dietary protein from animal products rather than vegetables have an increased risk of bone loss and hip fracture
The data suggested that women may be able to improve bone health by eating more vegetables.
"We should be encouraged to eat more vegetables and realize that our diets play an important role for our bones as we get older," said lead author Deborah Sellmeyer, MD, UCSF assistant professor of medicine and director of the Bone Density Clinic at UCSF Medical Center at Mount Zion. "There are lots of things we can do to improve bone health."
The study was published in the January 2001 issue of the American Journal of Clinical Nutrition. In the study, researchers gave 1,035 women enrolled in the Study of Osteoporotic Fractures a food frequency questionnaire, asking how much they ate of 64 different kinds of foods. They broke the food down into grams of protein, potassium, salt, and other categories. They scrutinized the protein part more carefully, determining how much protein the women were getting from animal products compared with vegetables.
The women, ages 65 to 80, were grouped into three categories: those with a high ratio of animal to vegetable protein, a middle range ratio, and low ratio, Sellmeyer explained. Researchers took the ratio and compared it with bone mineral density, bone loss, and fractures in a seven year follow-up period.
While there was no difference in initial bone mineral density among the groups of women, the high ratio category had three times the rate of bone loss as the women in the low group during the follow-up period. The high group also had 3.7 times the rate of hip fractures compared to the low group. This is after researchers adjusted for age, weight, estrogen use, tobacco use, exercise, total calcium intake, and total protein intake.
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