Are Your Bones Ageing? These Nutrients Can Help Slow The Process

Bone loss is a natural part of getting older, but prioritising certain foods can help slow the process down, writes Nikki Campo.

As we age, our bodies break down more bone tissue than they build. This can increase the risk of osteoporosis, a condition defined by weak, brittle bones, which can make them more susceptible to breaks and fractures. And for older adults, the results can be devastating — broken or fractured bones may give way to lengthy hospital or nursing home stays, long-term disability or even death.

The prime time to build bone is during adolescence, when the body is growing and devoting more resources to the task. And while your age, gender and genetics play significant roles in bone health, there are ways to slow bone loss in midlife and beyond. Exercise is a major part of this, but your diet is a big player, too, says Dr Bess Dawson-Hughes, a professor and senior scientist at the USDA Nutrition Centre at Tufts University in Massachusetts.

Here are some nutrients to prioritise to keep your bones healthy as you age.

Calcium

When you don’t get enough calcium from food, your body will pull the mineral from your bones, which can make them weaker, says Sue Shapses, a professor of nutritional sciences at Rutgers University in New Jersey.

Your ability to absorb calcium from food declines as you age too, she adds.

According to the US National Institutes of Health, women ages 19 to 50 need 1000mg of calcium each day, and 1200mg if they’re 51 or older. Men ages 19 to 70 need 1000mg, or 1200mg if they’re older.

Experts say that, if possible, it’s best to meet these recommendations with your diet rather than with supplements. Dairy products like milk and yoghurt are excellent sources of calcium, says Connie Weaver, a research professor at San Diego State University who studies how diet influences bone health. One cup of low-fat Greek yoghurt, for example, contains about a quarter of the calcium most people need in a day, she said.

If you can’t meet your calcium needs with food alone, taking a calcium supplement can help, Weaver said. Just make sure you don’t exceed the recommended amount, Dawson-Hughes adds. More is not always better, and excess calcium won’t provide extra protection for your bones.

Vitamin D

Vitamin D, which is crucial for maintaining strong bones because it helps your body absorb calcium from food, is synthesized in the skin after it is exposed to the sun’s ultraviolet B rays.

But the skin’s ability to do this synthesising declines with age, Dawson-Hughes says.

Certain vitamin D-rich foods can help make up for that loss. These include rainbow trout, salmon, canned tuna, mushrooms, egg yolks and milk, in addition to foods and drinks that are fortified with the vitamin, like some orange juices, plant milks and cereals.

Those between the ages of 1 and 70 need 600 IU (international units) per day, and those 70 and older need 800 IU daily. But it’s challenging for most people to reach those requirements with food alone, Shapses said.

It’s also not clear if turning to a vitamin D supplement will help with bone health. Recent research suggests that vitamin D supplements do not reduce the risk of fractures, so experts recommend consulting a doctor, who can advise whether vitamin D supplements are right for you.

Protein

Several studies in older adults have linked higher protein consumption with stronger bones.

But since protein plays two roles in the body — helping to absorb calcium in the gut and to excrete it in urine — you need to maintain sufficient levels of both protein and calcium for good bone health, said Shivani Sahni, an associate professor at Harvard Medical School.

In one 2021 study of more than 7000 older adults in retirement villages in Australia, for instance, those who consumed 3.5 servings of dairy (which is high in both calcium and protein) per day for two years had 33% fewer fractures than those who consumed only two servings per day. That’s similar to the effect of some osteoporosis drugs that are intended to reduce fracture risk, the study’s authors noted.

Federal guidelines say that most adults need 0.36g of protein per pound of body weight per day. For an 84kg person, that translates to 67g of protein each day. But some evidence suggests that adults 65 and older might benefit from slightly more protein — closer to 84g to 101g per day for an 84kg person.

Protein-rich foods include Greek yoghurt, salmon, beef, chicken, eggs, almonds, milk and lentils.

Other Vitamins and Minerals

Diets that incorporate a variety of fruits and vegetables, like the Mediterranean and DASH diets, can help support bone health, too, Sahni says.

The beneficial nutrients and plant compounds can help protect our cells from damage, further preventing or slowing the progress of osteoporosis, she says.

Leafy greens, fruits, nuts and legumes, for example, are rich in magnesium and potassium, which both support healthy bones. “Increasing the variety of foods you consume is one of the best ways to influence your bone health,” says Kelsey Mangano, an associate professor at the University of Massachusetts, Lowell, who studies nutrition and musculoskeletal ageing.

Prunes and blueberries have also been linked to bone health in older women. In a 2022 study of 235 postmenopausal women, for instance, those who ate four to six prunes per day for one year were less likely to lose hip-bone mineral density than those who ate none. Another small trial of 13 postmenopausal women found that those who consumed 17.5g of freeze-dried blueberry powder (equivalent to three-quarters of a cup of blueberries) per day for six weeks retained more bone calcium than they did during the weeks they didn’t consume the powder.

Weaver, who was an author on the blueberry and prune studies, says that although the blueberry study had few participants, the results were “statistically significant and about a quarter as effective as hormone replacement therapy, but without the side effects.”

But, she adds, it’s hard to say if these benefits were a result of the fruit itself, the fibre or something else, like the gut microbiome of the person eating the fruit. “There’s a lot to be learned,” she says.

Your diet alone won’t be enough to prevent bone loss. You still need to combine it with exercise, Mangano says.

Adults 65 and older should aim for at least 150 minutes of moderate aerobic activity each week (such as brisk walking or bike riding), as well as incorporating balance activities and at least two days of muscle-strengthening workouts, according to the Centres for Disease Control and Prevention.

“Exercise and a nutrient-rich diet with adequate calcium, vitamin D and protein are the foundation stones for healthy bones,” Shapses says. They’ll work together to benefit “multiple organs in the body, but especially bone”.

This article originally appeared in The New York Times

Written by: Nikki Campo

Illustration by: Kouzou Sakai

©2024 THE NEW YORK TIMES

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