Most vitamin studies called useless
‘ Foolish to suggest that a multivitamin which costs a nickel a day is a bad idea,’ says researcher
If a study in the Annals of Internal Medicine downplaying the benefits of vitamins left you clearing out your nutrient stash, you might have a rethink.
A new review published in the journal Nutrients indicates most large, clinical trials of vitamin supplements — whether they conclude vitamins are not beneficial or even harmful — have flawed methodology, making them useless. While the analysis focused on problems with studies on vitamin C, scientists say the findings are relevant to a wide range of vitamins.
Health professionals and associations agree it’s best to get nutrients by consuming a nutritious diet. But the reality is most people don’t eat as healthfully as they should for a variety of factors, such as budget and time constraints.
“More than 90 per cent of U. S. adults don’t get the required amounts of vitamins D and E for basic health,” said
Balz Frei, director of the Linus Pauling Institute at Oregon State University. “More than 40 per cent don’t get enough vitamin C, and half aren’t getting enough vitamin A, calcium and magnesium. Smokers, the elderly, people who are obese, ill or injured often have elevated needs for vitamins and minerals.”
So while there’s growing consensus taking vitamins isn’t necessary for those enjoying nutrient- packed foods, supplementation is still recommended for those with a poor diet.
The Nutrients review points out many studies assessing vitamins employ the same approach used for studying powerful prescription drugs. Frei said the conclusions have little scientific meaning, even less accuracy and often defy a wealth of other evidence.
“It’s fine to tell people to eat better, but it’s foolish to suggest that a multivitamin which costs a nickel a day is a bad idea,” said Frei.