March 30, 2011 |
Vitamin D levels in most Americans are adequate, with only 8% of the population at risk for health problems because of low vitamin D, according to a government report. Vitamin D is one confusing nutrient. Numerous studies in recent years have linked deficiency to a range of health problems and disease risk, including cancer, autoimmune diseases and diabetes. The nutrient also has a well-defined role in bone health. Some doctors and researchers have called for an increase in the recommended dietary intake of vitamin D. But in a report released late last year, the Institute of Medicine declined to raise the values saying: "The IOM finds that the evidence supports a role for vitamin D and calcium in bone health but not in other health conditions.
February 8, 2011 |
Eggs are getting a bit of a reprieve on the cholesterol front. A U.S. Department of Agriculture report released Tuesday says eggs are lower in cholesterol and higher in vitamin D than previously thought. The federal agency released these findings (helpfully publicized by the egg industry) after testing a random sample of eggs across the country and examining their nutrient value. It found the average large egg contained 185 milligrams of cholesterol (14% less than prior measures)
December 28, 2010 |
Even as a high-profile panel of experts recently disputed the conventional wisdom that Americans don't get enough vitamin D -- and that vitamin D deficiencies create greater risk of disease -- new research shows that newborns with low levels of vitamin D have higher rates of respiratory infection and wheezing than infants born with more vitamin D in their systems. There was no correlation, however, between low vitamin D levels and asthma. The study, published Monday in the journal Pediatrics, expanded on earlier work by Dr. Carlos Camargo of the Massachusetts General Hospital in Boston that had shown that babies born to mothers who took vitamin D supplements were less likely to develop wheezing during childhood.
December 13, 2010
I was deeply saddened with the Institute of Medicine report that we are a healthy nation in regard to our calcium and vitamin D intakes ["Sweeping Away the Hype About Vitamin D," Dec. 6]. As a physician keenly interested in my patients' nutrition status and needs, I find the report flawed. By arbitrarily setting the lower limit of normal vitamin D blood level at 20 nanograms per milliliter, they are missing the borderline deficiency between 20 and 40 ng/ml. I recommend 2,000 international units of vitamin D per day to my adult patients.
December 12, 2010 |
The Institute of Medicine recently upended the health apple cart with a new study that says we don't need as much calcium or vitamin D as we've been told. In fact, taking the kind of megadose that makes you feel virtuous and keeps the supplement industry healthy can lead to kidney stones, with calcium, and kidney or heart damage, with D. If that sounds alarmist, let me quote directly from the Institute of Medicine's statement, which says that "some signals suggest there are greater risks of death and chronic disease associated with long-term high vitamin D intake.
December 6, 2010 |
Every once in a while, some unsung nutrient gets rediscovered and, in the course of a few short years, is rendered virtually magical in the eyes of health professionals and consumers. Foods containing the nutrient come into vogue and supplement use soars. Then, seemingly overnight, the spell is broken. Last week, it was vitamin D's turn to fall from grace. The comedown came courtesy of an expert panel convened by the Institute of Medicine, which advises the government on health issues.
December 1, 2010 |
Vitamin D and calcium, calcium and vitamin D. We've heard the "get more" mantra for so long, small wonder a new report on vitamin D and calcium intakes is creating a buzz. The findings made news headlines because they dispute concerns about Americans being deficient in those nutrients, as this Los Angeles Times story says. But it turns out there are a host of such reports -- and the Institute of Medicine issues regular updates. Here's a plethora of tables that provide dietary guidelines for vitamins A, C, E and K, thiamin, riboflavin and other nutrients.
December 1, 2010 |
A team of experts convened by the Institute of Medicine sought Tuesday to douse growing concerns that North Americans are deficient in two key nutrients ? calcium and vitamin D ? and that they risk higher rates of a wide range of chronic diseases and cancers as a result. The panel concluded that "with few exceptions, all North Americans are receiving enough calcium and vitamin D" from the foods they eat ? many of which have been fortified with both nutrients. For all but a few, adding more of those nutrients in pill form would be useless at best and, at worst, would risk harm, added the report, which was two years in the making.
November 14, 2010 |
A vitamin D deficiency doubles the risk of fatal strokes in whites, but has no effect on the risk in blacks, even though blacks are more likely to have vitamin D deficiencies and are 65% more likely to die from strokes, researchers said Sunday. The results were puzzling, said Dr. Erin Michos of the Johns Hopkins School of Medicine in Baltimore. "We thought maybe the lower vitamin D levels might actually explain why blacks have higher risks for strokes," she said. Stroke is the third leading cause of death in the United States, killing more than 140,000 Americans annually and permanently disabling more than half a million.
October 18, 2010
People with a rare, genetic condition that causes skin cancer usually studiously avoid sunlight in order to reduce their cancer risk. But, in doing so, these people increase their risk of vitamin D deficiency, researchers reported Monday. Basal cell nevus syndrome causes people to develop basal cell cancer lesions as early as adolescence. But in a study of 41 people with the condition, more than half were found to be deficient in vitamin D. Vitamin D is synthesized in the skin from exposure to sunlight.