Thursday, October 22, 2009

Vitamin supplements could do more harm than good

At last the word is getting out

People taking high-dose vitamin and mineral supplements may be doing more harm than good, an expert has warned. Professor Martin Wiseman, medical and scientific adviser for the World Cancer Research Fund (WCRF), said it was difficult to predict the impact vitamin supplements had on the chances of cutting cancer.

While low dose supplements can be a "valuable safety net", high doses could be harmful. Research over the last few years has suggested some vitamins can actually increase the risk of some cancers. Beta carotene for example can increase the risk of lung cancer in those who already smoke.

"Many people think they can reduce their cancer risk by taking supplements, but the evidence does not support this," Prof Wiseman said. "Just because a dietary pattern that provides a relatively high level of a particular nutrient might protect against cancer, it does not mean that taking it in tablet form will have the same effect. "In fact, at high doses the effect of these micronutrients is unpredictable and can be harmful to health.

"Although there are some studies that have shown a reduction in cancer risk from high-dose supplements, others have not, and these supplements have normally only been tested on a select group of people.

"This means we simply do not know enough about what the effect will be for the general population to confidently predict the balance of risks and benefits. Some people may be doing themselves more harm than good.

"There are also studies that show high doses of some supplements can increase risk of some cancers.''

Prof Wiseman said multivitamins would not contain all the good nutrients found in food, such as fibre adding that the best advice was to have a "health, plant-based diet with lots of fruits and vegetables".

Prof Wiseman's comments echo similar sentiment from Professor Brian Ratcliffe, a leading nutritionist, who last month said Britain's "worried well" were wasting their money and possibly risking their health by taking supplements.

Prof Ratcliffe said multivitamin and mineral supplements were "completely pointless" for the majority of people with a healthy diet and that topping up on vitamins could potentially be dangerous.

SOURCE

Posted via email from Garth's posterous

15 comments:

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Taking natural supplement is better than artificial supplement because it contains natural ingredients that are beneficial to our health system. It is good to take it regularly to maintain a youthful glow.

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