The news about D the sunshine vitamin that loves your bones, nerves, muscles, heart, blood sugar and may even help fight cancer just got a little better right in time for cold and flu season.
In a headline-grabbing report, Japanese researchers found that taking 1,200 IU of D-3 supplements daily can cut your risk of catching influenza A by 50 percent. And even though theres been recent press about a French meta-study that casts doubt on Ds disease-fighting ability, were still devoted to vitamin D-3 from food, sun and supplements.
We think that study didnt look at the results of serious deficiency and its estimated that overall around 42 percent of adults have D-3 levels below 20 ng/ml (in general, levels below 30 ng/ml are too low for bone health), while 82 percent of blacks and 70 percent of Hispanics are deficient.
Theres plenty of solid research showing the real benefits from vitamin D-3 which wont harm you if taken at recommended doses. A daily dose of at least 600 IU (800 IU if youre 71 or older), but no more than 4,000 IU, helps your body absorb and use more calcium (great for bones), discourages cancers of the colon, breast and prostate, lowers your risk for autoimmune disorders such as Type 1 diabetes and can assist with blood pressure control, too.
Theres also growing evidence that having sufficient D-3 helps your cells absorb blood sugar properly.
One reason were excited by the Japanese study of D-3s impact on the flu is that it highlights how vitamin D-3 boosts immune cells ability to spot and pick off invaders, such as viruses. But D-3s no substitute for a flu vaccine. Do this too:
Æ Get your doc to check your D level. Levels below 20 ng/ml thats where almost half of all North Americans come in are dangerously low, raising the risk for thinning bones and surgical complications. We recommend aiming for 50-80 ng/ml.
Æ Aim for 1,000 IU daily. Make sure your supplement is D-3, also known as cholecalciferol. Its more stable and does a better job of raising D blood levels, and thats what counts. Its also smart to reach for D-3-rich foods: fortified dairy products (fat-free milk, low-fat cheese, low-fat, no-sugar-added yogurt) have D-3; so do fortified breakfast cereals and orange juice. Salmons a rich natural source.
Æ Mix brands. After a recent analysis found big variations in the actual amount of D-3 in many supplements, Dr. Mike started taking D-3 from more than one brand. Switching back and forth could help average out low or high levels in supplements.
Æ Take it with lunch or dinner. A study at the Cleveland Clinic says you can increase vitamin D-3 absorption 50 percent by taking it with your biggest meal.
Æ Dont rely on the sun. Older people, especially, just cant make enough D-3 from the sun in the winter.
If you live in the South in the winter, or just about anywhere during spring, summer and fall, expose your face, hands and arms for 15 minutes to get a natural dose. Then apply a sunscreen with an SPF of 30 that protects against UVA and B.
A light-skinned person in the Northeast can stimulate the release of around 20,000 IU of D-3 into the bloodstream with 15 minutes of sun exposure, without sunscreen.
Mehmet Oz, M.D., is host of The Dr. Oz Show, and Mike Roizen, M.D., is chief medical officer at the Cleveland Clinic Wellness Institute. To live your healthiest, visit sharecare.com.