Protein Diets Assist Weight Loss, But May Lower Bone Density In Postmenopausal Girls

Protein Diets Assist Weight Loss, But May Lower Bone Density In Postmenopausal Girls

July 7, 2010 by Amy Patterson Neubert
Chubby and moderately obese postmenopausal women using diets based on higher protein intake also want to concentrate on potential bone loss, in keeping with new analysis from Purdue University.
"We all know that when overweight, postmenopausal ladies reduce their vitality consumption to successfully reduce weight, they can lose much less lean body mass once they eat higher quantities of protein and include lean meats, such as pork loins, ham, beef and chicken, of their diet," stated Wayne W. Campbell, professor of foods and nutrition. "Nonetheless, we additionally found that these older ladies lost bone mineral density sooner than ladies who consumed regular protein diets that did not include any meats. This finding is of concern for this age group that's susceptible to osteoporosis."
Campbell and doctoral student Minghua Tang analyzed knowledge from two controlled weight loss program research. Within the first examine, they decreased 28 girls's individual every day diets by 750 calories to achieve a one-and-one-half-pound weight loss every week for 12 weeks. These postmenopausal women ranged in age from 43-80. Fifteen ladies consumed meat-free diets with protein from vegetarian, dairy and egg sources, comprising 18 p.c of every girl's power intake. This quantity of protein was akin to the really helpful dietary allowance of zero.36 grams of protein per pound of body weight per day.
The diets for the other thirteen women were composed of 30 % of energy from protein with 40 p.c of the protein from lean pork, such as loin and ham, and 60 percent of the protein from vegetarian, dairy and egg sources. The women, on average, lost about 19 pounds each, however those that ate the upper-protein, meat-containing weight-reduction plan misplaced bone mineral density.
Within the second examine, forty three postmenopausal women every ate a 1,250-calorie diet for 9 weeks. All participants consumed the same 1,000-calorie vegetarian food regimen, however 15 women acquired 250 energy from chicken breast meat, 14 women acquired 250 calories from beef tenderloin and 14 ladies acquired 250 energy from shortbread cookies and sugar-coated candies. One other eleven ladies served because the control group. The researchers noticed again that the entire women who ate the energy-reduced diets successfully misplaced weight, however the groups that consumed the upper-protein meat-containing diets additionally misplaced bone mineral density in comparison with the control group.
The bone mineral density was measured utilizing a dual-energy X-ray absorptiometer.
The findings are printed online in the Journal of Gerontology: Medical Sciences and might be printed in September.
"Purposeful, reasonable weight reduction is an efficient approach for overweight postmenopausal women to improve their health and well-being," Campbell stated. "Nonetheless, research shows that older ladies are at risk of dropping bone when they shed extra pounds, and our findings highlight that amount and sources of protein are necessary to think about when selecting a weight-loss weight loss program. Each particular person wants to guage, or consult with a dietitian about the best way to achieve and sustain a wholesome body weight and physique composition, including muscle and bone."
Campbell and Tang indicate that extra analysis is needed to better perceive how different quantities and sources of protein affect bone when individuals reduce weight.
"The influence of dietary protein on bone stays controversial, and details about dietary protein and bone from research with weight-stable subjects may not be relevant to weight loss," Campbell stated. "We know that bone is constantly forming and breaking down, and how fast these two processes happen determines the density of your bones. We do not have the info at this time to know the mechanisms involved with these modifications in bone density.
"It is also essential to note that these two research were comparatively short, 9 to 12 weeks, so studies to judge how protein intakes impression physique composition and bone past the period of active weight reduction could be useful."
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