Time to kick the multivitamin habit, studies suggest: Don't help prevent disease, might cause harm.

[salvorhardin]

If you're like many Prevention readers, multivitamins have been a key part of your daily routine since... well, forever. As recently as 2002, no less an authority than the Journal of the American Medical Association recommended that "all adults take one multivitamin daily." We at Prevention have suggested them to you dozens of times over the years as well. And many doctors and nutritionists still urge a multivitamin to any "less-than-perfect eater" to compensate for dietary shortfalls.

But today, a tsunami of scientific data has resulted in a reversal in thinking among many experts in the health and nutrition community, including Miriam Nelson, PhD, director of the John Hancock Research Center on Physical Activity, Nutrition, and Obesity at Tufts University. "The multivitamin as insurance policy is an old wives' tale, and we need to debunk it," she says.

The sea change is supported by two massive studies. The first, a review of 63 randomized, controlled trials (the gold standard research method) on multivitamins, published by the Agency for Healthcare Research and Quality, found that multis did nothing to prevent cancer or heart disease in most populations (the exception being developing countries where nutritional deficiencies are widespread). In the second paper, published last year, scientists at the Fred Hutchinson Cancer Research Center followed 160,000 postmenopausal women for about 10 years. The researchers' conclusion: "Multivitamins failed to prevent cancer, heart disease, and all causes of death for all women. Whether the women were healthy eaters or ate very few fruits and vegetables, the results were the same," says the lead author, Marian Neuhouser, PhD.

Maybe you never expected your multi to prevent breast cancer or head off a heart attack. Maybe you just felt that taking one would make you healthier by boosting your immunity or energy level. But research on those benefits is equally discouraging, especially in specialized groups on which you'd expect them to have an impact. For instance, a British review of eight studies found no evidence that multis reduced infections in older adults. Another study found that the vitamins didn't improve fatigue among breast cancer patients undergoing radiation therapy. And inner-city schoolchildren who took a multi did not perform any better on tests or have fewer sick days than students who didn't take one.
Full article: http://www.msnbc.msn.com/id/39616169/ns/health-diet_and_nutrition

The article goes on to suggest that for people aged 50 or older who eat a relatively balanced diet, that you might still want to take supplements for Vitamin D, Omega-3, and calcium. However, I think it should be noted that the research is equivocal for calcium supplements at best, Omega-3 supplements have been pretty well shown not to do anything and we're still unsure about Vitamin D supplements although it's looking like most people do not get enough exposure to sunlight so they might be a good idea.