Unhealthy habits can reduce people's brainpower. That's the conclusion of a 17-year study of 5,123 British civil servants by researchers from Hopital Paul Brousse in Villejuif, France. The participants in the study took tests for memory, wordpower, mental arithmetic and logic when they were 44, 56 and 61 and were asked about their diet, smoking and drinking and exercise. Smokers did worse but teetotallers performed worse than moderate drinkers and people who had less than two servings of fruit and vegetables a day also did worse. People who took less exercise also showed a greater decline in brainpower.
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