ISMNT News #55. Although the Mediterranean diet was thought to have a preventive action for cardiovascular disease and cancer, it was always argued that differences in lifestyle might be the magic underlying cause and not just diet. The Lyon Diet Heart Study clarifies this point. During the follow-up of 4 years, patients following the Mediterranean diet exhibited a prolonged survival and may also be protected against cancer. Although further studies are warranted to confirm the data, it raises the intriguing question whether the American Heart Association prudent diet is indeed the diet we should follow.

The key reference is by:

de Lorgeril M, Salen P, Martin JL, Monjaud I, Boucher P, Mamelle N

Laboratoire de Physiologie and GIP-Exercice, Centre Hospitalo-Universitaire de Saint-Etienne and School of Medicine, France

Mediterranean dietary pattern in a randomized trial: prolonged survival and

possible reduced cancer rate

Arch Intern Med 1998 Jun 8;158(11):1181-1187

BACKGROUND: The Mediterranean dietary pattern is thought to reduce the risk of cancer in addition to being cardioprotective. However, no trial has been conducted so far to prove this belief.

METHODS: We compared overall survival and newly diagnosed cancer rate among 605 patients with coronary heart disease randomized in the Lyon Diet Heart Study and following either a cardioprotective Mediterranean-type diet or a control diet close to the step 1 American Heart Association prudent diet.

RESULTS: During a follow-up of 4 years, there were a total of 38 deaths (24 in controls vs 14 in the experimental group), including 25 cardiac deaths (19 vs 6) and 7 cancer deaths (4 vs 3), and 24 cancers (17 vs 7). Exclusion of early cancer diagnoses (within the first 24 months after entry into the trial) left a total of 14 cancers (12 vs 2). After adjustment for age, sex, smoking, leukocyte count, cholesterol level, and aspirin use, the reduction of risk in experimental subjects compared with control subjects was 56% (P=.03) for total deaths, 61% (P=.05) for cancers, and 56% (P=.01) for the combination of deaths and cancers. The intakes of fruits, vegetables, and cereals were significantly higher in experimental subjects, providing larger amounts of fiber and

vitamin C (P<.05). The intakes of cholesterol and saturated and polyunsaturated fats were lower and those of oleic acid and omega-3 fatty acids were higher (P<.001) in experimental subjects. Plasma levels of vitamins C and E (P<.05) and omega-3 fatty acids (P<.001), measured 2 months after randomization, were higher and those of omega-6 fatty acids were lower (P<.001) in experimental subjects.

CONCLUSIONS: This randomized trial suggests that patients following a cardioprotective Mediterranean diet have a prolonged survival and may also be protected against cancer. Further studies are warranted to confirm the data and to explore the role of the different lipids and fatty acids in this protection.