Mediterranean eating pattern may lower fracture risk

A major review suggests that people who followed a Mediterranean-style diet more closely had a lower risk of fractures. The results indicate that broader eating habits may influence bone health even when bone-density readings do not show a clear change.

The review also pointed to a different effect with calorie restriction: markers of bone breakdown appeared to rise. Taken together, the findings show that a diet’s impact on the skeleton can extend beyond its effect on body weight.

Researchers at the University of Chester examined 30 studies involving more than 500,000 adults. Their review, published in Nutrients, assessed evidence on Mediterranean, calorie-restricted, high-protein, low-carbohydrate and ketogenic diets and their relationship with skeletal health.

The analysis drew on fourteen randomized trials and sixteen observational studies. The team evaluated bone mineral density, fracture risk, and blood or urine markers that reflect how quickly bone is broken down and rebuilt.

Bone is living tissue that is constantly renewing itself. Bone mineral density measures how much mineral is packed into the skeleton, while turnover markers offer clues about the activity of the cells that replace old tissue.

Across the different diet categories, the combined data did not show clear changes in density at the hip, lower spine, thigh-bone neck or whole body. That does not mean diet has no role, but it does suggest density alone does not capture the full picture.

Stronger adherence to a Mediterranean diet was associated with fewer fractures of the hip and overall. This pattern typically emphasizes vegetables, fruit, whole grains, beans, nuts, fish and olive oil, bringing a range of nutrients together within a broader eating style.

The researchers noted that calcium, magnesium, vitamin K and other food components could all have played a part. Those ideas remain possibilities for further study rather than proof that any single nutrient was responsible for the lower fracture rates.

By contrast, calorie-restricted diets were consistently tied to higher markers of bone resorption, the process in which old bone is broken down. A shift in these markers does not automatically mean a person will suffer a fracture or develop osteoporosis.

Weight loss can reduce the load that bones must bear, and restrictive eating can alter nutrient intake. Even so, the review did not show that all weight-loss diets harm the skeleton or that everyone responds in the same way.

Findings for high-protein and low-carbohydrate diets were mixed or neutral, with substantial differences between studies. Variations in participants, diet definitions and follow-up periods make it hard to pinpoint one effect that applies in every setting.

The clearest practical takeaway is that bone research should look at several measures, including actual fractures as well as density and turnover. Mediterranean-style eating showed a favorable association with fractures, while important questions remain about how to protect bone during diet and weight changes.

For broader related reading on nutrition and health, please see articles about How the Mediterranean diet could slow aging and reduce disease risk, and Muscle meals: the best and worst foods for strength.

For more information, please see articles about How can vitamin D benefit your health, and All about vitamin C: why we need it and how to get it.

Source: University of Chester.