These nutrients can strengthen aging bones

Calcium

When you don’t get enough calcium from food, your body will pull the mineral from your bones, which can make them weaker, said Sue Shapses, a professor of nutritional sciences at Rutgers University. Your ability to absorb calcium from food declines as you age too, she said.

According to the National Institutes of Health, women ages 19 to 50 need 1,000 milligrams of calcium each day, and 1,200 mg if they’re 51 or older. Men ages 19 to 70 need 1,000 mg, or 1,200 mg 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 yogurt are excellent sources of calcium, said Connie Weaver, a research professor at San Diego State University who studies how diet influences bone health. One cup of low-fat Greek yogurt, for example, contains about a quarter of the calcium most people need in a day, she said.

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 synthesizing declines with age, Dawson-Hughes said.

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. Protein makes up about half of bone volume and is essential for replacing bone when it is lost.

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 7,000 older adults in senior living centers 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.

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

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,” said Kelsey Mangano, an associate professor at the University of Massachusetts, Lowell, who studies nutrition and musculoskeletal aging.

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 17.5 grams 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, said 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 added, it’s hard to say if these benefits were a result of the fruit itself, the fiber or something else, like the gut microbiome of the person eating the fruit. “There’s a lot to be learned,” she said.