Dietary fibre or whole grains or both?
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The role of dietary fibre and whole grains in health and disease has become clearer, in some cases, and still generates controversy in others. Animal and many epidemiological studies often link adequate intake of dietary fibre and whole grains to important health promoting benefits. However, some epidemiological and intervention studies do not support a disease risk reduction role. Adding to the controversy is the fact that epidemiological studies frequently have confounding in that those who have the highest intakes of whole grains and dietary fibre often have other dietary and lifestyle choices that lower their risk for the disease in question. Despite these drawbacks, new information on the effects of whole grain and dietary fibre continues to emerge and suggest that both these dietary components are important in reducing the risk of metabolic syndrome, type 2 diabetes, coronary heart disease and some types of cancer. There may even be a role for dietary fibre and whole grains in helping to maintain normal body weight and in aiding various weight loss and maintenance diets. Possible mechanisms of action, synergies of the many phytochemicals and fibre found in whole grains are addressed along with possible reasons why different studies generate conflicting results. There is still controversy around whether the effects seen with the ingestion of whole grains are due to the fibre or to the co-travellers or to their synergy. The one major point of agreement is that dietary intake of both dietary fibre and whole grains is too low in most developed nations, and there must be concerted effort to change this.