Intellectual Functions with Restricted Intakes of B-Complex Vitamins

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Abstract
8 normal young men were maintained for 161 days on a diet restricted in B-complex, followed by 23 days of almost total deprivation. During partial restriction there was no intellectual deterioration, as measured by two intelligence tests and Porteus'' mazes, and no loss in learning ability. In acute deprivation there was limited deterioration of intellectual functions, speed being the factor most affected; learning rate was not impaired, but there was a relative downward shift in level of performance. The intellectual functions appear to be among those most resistant to dietary stress.