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Diet for Healthy Bones

Much of what you hear about diet and osteoporosis is out of date.

By
Monica Reinagel, M.S.,L.D./N,
June 8, 2010
Episode #025

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Marilyn wrote this week with a question about nutrition and bone health.

I am 54 and have done weight-bearing exercise and eaten a balanced, healthy diet all my life but I recently got diagnosed with severe osteoporosis. My mother was crippled by osteoporosis. What can I do nutritionally to help strengthen my bones?

Well, Marilyn, it sounds like you have been doing all the right things. But, in addition to diet and lifestyle, genetics can play a big role in whether or not you get osteoporosis. The fact that your Mom also had osteoporosis suggests that genetics may have played a role in your case. Your doctor may prescribe a medication to help with your bone loss but you’re smart to be thinking about what you can do nutritionally, as well.

It’s something we all need to think about, whether we are young or old, male or female, and whether we have osteoporosis in the family or not. All of use will lose bone as we age. If you don’t start out with really strong bones, you can get into trouble pretty quickly. It’s never too late to start taking better care of your bones, but it’s best to start young.

A Lot of Out-of-Date Information

I’ve got some good news and some bad news. The good news is that a healthy diet can do wonders to protect your bones. The bad news is that most of what you read about nutrition and osteoporosis is out of date. For example, you’ll find a lot of articles claiming that high-protein diets cause bone loss. You’ll also read that caffeine, sodium, and phosphates weaken bones.

But there’s a little more to the story. It’s true that when you take in more protein, caffeine, sodium, and/or phosphates (which are found in colas), you tend to lose more calcium in your urine. The concern is that this robs your bones of needed calcium. However, your body is pretty smart. It can compensate for these losses by increasing the amount of calcium that it absorbs from the foods you eat.

As long as your diet contains enough calcium and other bone-building minerals, these dietary factors actually have little to no long-term effect on bone health. Unfortunately, most of us aren’t getting nearly enough calcium.

Dairy products like milk, yogurt, and cottage cheese are all good sources of calcium. Non-dairy alternatives like soymilk are often fortified with calcium as well. You can also get calcium from vegetables like spinach, kale, arugula, and grape leaves.

It’s Not Just About Calcium

While calcium is the thing you probably think of first, there are many other nutrients that are important to bone health. In particular, vitamins D and K are critical to strengthening bones. Vitamin K is found in vegetables like spinach, kale, broccoli, and Brussels sprouts.

Notice anything? Many of the vegetables that are high in vitamin K are also high in calcium. Perhaps that explains this mystery: Researchers noticed that people whose diets are high in vitamin K have a much lower incidence of bone fractures as they get older than people whose diets are low in vitamin K. “A-ha!,” we thought. “Vitamin K prevents osteoporosis.”

Later, we were disappointed to find that taking vitamin K supplements had no effect on fracture risk. But the folks with strong bones weren’t taking vitamin K supplements, they were eating foods rich in vitamin K. It just so happens that these foods are also rich in calcium, magnesium, and other bone-building nutrients. In other words, single nutrients don’t prevent bone loss. But a nutrient rich diet does.

There’s one other nutrient that I should mention here and that’s vitamin D, which is actually more like a hormone than a nutrient. One of its key jobs is helping your body absorb and use calcium. Your body makes vitamin D when your skin is exposed to sunlight. Unfortunately, what with clothes, roofs, and sunscreen, we don’t get as much sun on our skin as we used to. You can also get vitamin D from fish and from milk or soymilk that has vitamin D added to it. 

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