Nutritional Pearls: Preventing Hip Fractures

Answer: Following a Mediterranean diet is associated with a decreased risk of hip fracture, as compared to other diets.

Bone health is a real concern for people as they get older. While all broken bones are serious, hip fractures can have long-term effects on an individual's health and quality of life. For years we've been told to drink our milk or take calcium or vitamin D supplements, but as we've seen in previous research, milk might actually be bad for our bones, while vitamin D supplements alone have no real effect on bone mineral density.

As is so often the case, it seems that research has largely focused on individual vitamins or minerals. But we don't eat vitamins or minerals, we eat food. An international team of researchers noted that deficiencies in single nutrients often "reflects a poor diet quality," and sought to analyze overall dietary patterns and their impact on hip fractures.¹

The Research

The authors made use of data gathered through the Women's Health Initiative, a study including over 90,000 postmenopausal women aged 50 and 79 during the enrollment period of the study, which lasted from 1993 to 1998. At the start of the study, the participants underwent a bone mineral density scan, responded to a detailed dietary questionnaire, and provided health history, family history, and demographic information.

With the results from the dietary questionnaire, the researchers were able to assign each participant to one of 4 overall dietary patterns, with 5 increasing levels of adherence to each pattern. The patterns included a slightly modified Mediterranean diet score (aMED) of 0 to 9 points, a pattern aligned with the US Dietary Guidelines for Americans of 2010 (HEI-2010) of 1 to 100 points, an alternative version of the HEI-2010 known as the AHEI-2010 (0 to 110 points), and a Dietary Approaches to Stop Hypertension (DASH) pattern of 8 to 40 points.

After an average of 16 years of follow-up, the authors analyzed the diets of those who experienced a bone fracture of any kind as well as those who specifically experienced a hip fracture. They then compared these individuals’ dietary patterns and scores with those who did not experience a bone fracture.

The Results

Of the 4 dietary patterns, those in the highest levels of adherence to a Mediterranean diet (scoring from 7 to 9 points) were 20% less likely to break a hip than those whose Mediterranean diet score was a 0 or 1. The highest HEI-2010 and DASH scores were linked to lower risk of hip fracture, but not to a degree the authors felt was clinically significant. Overall risk of fractures anywhere in the body did not appear to be affected by any of the dietary patterns (the AHEI-2010 affected neither hip nor overall risk of fracture).

What’s the Take-Home?

All of the dietary patterns are fairly similar, but the Mediterranean diet is higher in monounsaturated fats from sources, such as olive oil and high fish intake. The AHEI-2010, on the other hand, emphasizes more polyunsaturated fatty acids and lower intake of red or processed meats. Some readers will be asking themselves if it's the olive oil or the fish that's the protective ingredient, but the point here is that single nutrients or ingredients are not magic bullets—it's an overall dietary pattern that appears to be protecting people from hip fractures.

Reference:
1. Haring B, Crandall CJ, Wu C, et al. Dietary patterns and fractures in postmenopausal women [published online March 28, 2016]. JAMA Intern Med. doi:10.1001/jamainternmed.1016.0482.