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Micronutrients: dietary intake v. supplement use

Published online by Cambridge University Press:  07 March 2007

Jayne V. Woodside*
Nutrition and Metabolism Group, Centre for Clinical and Population Science, Mulhouse Building, Grosvenor Road, Belfast BT12 6BJ, UK
Damian McCall
Nutrition and Metabolism Group, Centre for Clinical and Population Science, Mulhouse Building, Grosvenor Road, Belfast BT12 6BJ, UK
Claire McGartland
Nutrition and Metabolism Group, Centre for Clinical and Population Science, Mulhouse Building, Grosvenor Road, Belfast BT12 6BJ, UK
Ian S. Young
Nutrition and Metabolism Group, Centre for Clinical and Population Science, Mulhouse Building, Grosvenor Road, Belfast BT12 6BJ, UK
*Corresponding author: Dr Jayne Woodside, fax +44 28 90235900, email
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Whilst clinical deficiency of micronutrients is uncommon in the developed world, a suboptimal intake of certain micronutrients has been linked with an increased risk of chronic diseases such as CVD and cancer. Attention has therefore focused on increasing micronutrient status in order to theoretically reduce chronic disease risk. Increasing micronutrient status can involve a number of approaches: increasing dietary intake of micronutrient-rich foods; food fortification; use of supplements. Observational cohort studies have demonstrated an association between high intakes of micronutrients such as vitamin E, vitamin C, folic acid and β-carotene, and lower risk of CHD, stroke and cancer at various sites. However, randomised intervention trials of micronutrient supplements have, to date, largely failed to show an improvement in clinical end points. The discordance between data from cohort studies and the results so far available from clinical trials remains to be explained. One reason may be that the complex mixture of micronutrients found, for example, in a diet high in fruit and vegetables may be more effective than large doses of a small number of micronutrients, and therefore that intervention studies that use single micronutrient supplements are unlikely to produce a lowering of disease risk. Studies concentrating on whole foods (e.g. fruit and vegetables) or diet pattern (e.g. Mediterranean diet pattern) may be more effective in demonstrating an effect on clinical end points. The present review will consider the clinical trial evidence for a beneficial effect of micronutrient supplements on health, and review the alternative approaches to the study of dietary intake of micronutrients.

Symposium on ‘Micronutrients through the life cycle’
Copyright © The Nutrition Society 2005


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