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Nutrition | Is Too Much Protein Bad for Bones?

Is Too Much Protein Bad for Bones?

Along with well-known minerals like calcium and vitamin D, getting enough protein is essential for bone health. However, since previous studies have found that eating very high amounts of dietary protein may increase the amount of calcium the body excretes, researchers have wondered: can too much protein actually be bad for bone health? A study published in the American Journal of Clinical Nutrition suggests the answer is “No,” reporting that higher dietary protein did not harm bones of premenopausal women.

Eating for strong bones

To explore the link between dietary protein and bone health, researchers enrolled 560 premenopausal women ages 14 to 40 years old and assessed their bone mineral density and the amount and type of dietary protein they ate over 3 years. Results showed:

  • The average amount of protein that women ate was 15.5% of energy or calories consumed.


  • Women who ate more dietary protein had similar bone mineral density levels as women who ate less. In other words, higher dietary protein did not have a bad effect on their bones.


  • Women who ate less vegetable protein had lower bone mineral density compared with women who ate more—another good reason to eat plenty of veggies.

Few women in this study were consuming what is considered the upper limits of the recommended amount of protein that women should consume, which is 35% of total calories. So the authors note that it still isn’t known whether very high amounts of protein may have a poor effect on bone, or what the optimal amounts of protein for bone health might be.

Choose good habits to protect bones

There are a number of important steps a woman can take to optimize her bone health—take a look at these tips:

  • Be informed. Talk with your doctor about how to keep your bones healthy throughout all phases of your life, and ask when you should begin having tests to monitor bone mineral density.


  • Exercise regularly. Weight-bearing exercises such as walking have been shown to maintain and improve bone density. Try to exercise daily for optimal health.


  • Eat a balanced diet. Our bodies and bones need a mix of nutrients that come from a healthy diet, which includes a source of protein, an abundance of fruits and vegetables, legumes, and other basic foods.


  • Get your calcium and vitamin D. Talk with your doctor about how much of these nutrients you should be getting in your daily diet or through supplements for optimal bone health.


  • Avoid tobacco and limit alcohol. Tobacco and excess alcohol may harm your bones. If you smoke—quit. And limit alcohol to the recommended guidelines of one drink per day for women and one or two drinks per day for men.

(Am J Clin Nutr doi: 10.3945/ajcn.2009.28728)

April 22, 2010

Jane Hart, MD, board-certified in internal medicine, serves in a variety of professional roles including consultant, journalist, and educator. Dr. Hart, a Clinical Instructor at Case Medical School in Cleveland, Ohio, writes extensively about health and wellness and a variety of other topics for nationally recognized organizations, websites, and print publications. Sought out for her expertise in the areas of integrative and preventive medicine, she is frequently quoted by national and local media. Dr. Hart is a professional lecturer for healthcare professionals, consumers, and youth and is a regular corporate speaker.

Copyright © 2010 Aisle7. All rights reserved. Republication or redistribution of the Aisle7® content is expressly prohibited without the prior written consent of Aisle7. Healthnotes Newswire is for educational or informational purposes only, and is not intended to diagnose or provide treatment for any condition. If you have any concerns about your own health, you should always consult with a healthcare professional. Aisle7 shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon. AISLE7 is a registered trademark of Aisle7.

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The health information contained in this site is not intended as medical advice and should not be considered a substitute for appropriate medical care. Any products mentioned in studies cited in Healthnotes articles are not necessarily endorsed by Bastyr. As with any product, consult with a natural health practitioner to discuss what may be best for you.

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