Vitamin D Details - Tips Healthy Today

Vitamin D Details - Tips Healthy Today

Chủ Nhật, ngày 20 tháng 12 năm 2015

What vitamin D is: Vitamin D is a hormone manufactured in the body when skin is exposed to sunlight. Because vitamin D is fat-soluble, the body can store it for the days or even months when you dont get any sun or consume any vitamin D. Besides fortified milk and some fish, few foods supply the vitamin.

Many people are deficient in vitamin D, especially those who are over 60, live at northern latitudes, have darker skin or are rarely outdoors. In the northern United States and in Canada, blood levels drop markedly in the winter, when days are shorter, the sun is weaker, and we wear more clothes. Obesity is associated with reduced blood levels of vitamin D.

Claims, purported benefits: Works with calcium to keep bones strong. May reduce the risk of everything from heart disease, multiple sclerosis and some cancers to diabetes, infections, hypertension and falls caused by age-related muscle weakness.What the studies show: Studies on vitamin D (mostly observational) are published nearly every month, most suggesting potential benefits. In 2010, the Institute of Medicine (IOM) came out with guidelines for recommended intakes of vitamin D. These pertain only to bone health and fracture reduction, since the IOM panel concluded that the evidence for all other benefits was inconsistent and/or inconclusive or did not demonstrate causality. The recommended intake is 600 International Units (IU) a day through age 70. For those over 70, the goal is 800 IU. The panel also doubled the safe upper level intake to 4,000 IU a day. It said that the great majority of people do not need supplements.

Many prominent vitamin D experts were disappointed by the guidelines, which they consider too low, and typically recommend supplements of at least 1,000 to 2,000 IU a day. And they point to evidence that its safe to take as much as 10,000 IU a day.

In 2012, the U.S. Preventive Services Task Force (USPSTF) concluded with moderate certainty that standard doses of calcium (1,000 milligrams) and low doses of vitamin D (400 IU or less) do not prevent fractures in postmenopausal women without osteoporosis. Thus it advised such women not to take the supplements. Because the evidence is inadequate, the panel did not pass judgment on calcium and higher doses of vitamin D for fracture risk, nor did it discuss younger women, men, people with osteoporosis or those living in nursing homes.

Many researchers raised objections to the draft guidelines, saying the Task Force misinterpreted the research or at least put too negative a spin on it. In particular, critics questioned the focus on low-dose vitamin D, since theres a growing consensus that higher doses are needed for bone health. The Task Force itself stated that 400 IU would not be considered sufficient today.

Also in 2012, another USPSTF panel reviewed research on fall prevention and recommended that older people take vitamin D supplements to prevent falls, which are the leading cause of fractures.

The IOMs dietary recommendations are conservative and pertained only to bone health. Rigorous clinical trials are underway to test the claims made about potential non-bone benefits of vitamin D, but the results wont be in for years. Meanwhile, you may wish to follow the IOMs advice and not take vitamin D pills, especially if you want to be cautious, you get some sun exposure and you prefer not to take supplements. If you want to be more proactive, you may want to follow the advice of the many vitamin D experts who believe that theres a good likelihood of benefit at blood levels of at least 30 to 40 ng/mL, and thus recommend higher intakes1,000 to 2,000 IU or more a dayespecially for groups at risk for vitamin D deficiency.

A sensible middle ground is 800 to 1,000 IU of supplemental D a day, plus modest amounts of sun exposure. However, if you have osteoporosis or certain other medical conditions and/or your doctor says your blood level is low, youll probably need higher doses.

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My name is Tran Thanh Vy. I love to introduce all some tips to have a healthy life today such as healthy eating, healthy mind, fitness, ...

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To get your fill of vitamin C every day, think beyond boxed orange juice or a multivitamin. Theres a wide variety of great sources of vitam...

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Since the National Organic Standards from the United States Department of Agriculture (USDA) went into effect a decade ago, shopping for org...

Stretching improves flexibility, which allows you to move your joints through their full range of motion. And flexibility is a key element o...

How much protein do you eat? Probably more than you think. Meat, fish, and chicken have 6 to 9 grams per ounce. Milk has 8 grams per cup; pl...

Low-intensity exercise is often promoted in fat-burner aerobics classes as a way to maximize fat metabolism. Such claims are misleading. I...

Eggs have a bad reputation because of their high cholesterol content: 185 milligrams in the yolk of a large egg. But, in fact, dietary chole...

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