Malnutrition during development leads to high infant mortality and lowered physical size. While severe malnutrition may lead to intellectual impairment, the direct relationship between moderate malnutrition and intelligence is still unknown. This is because both nutrition and intellectual development are associated with various social factors. While malnutrition is a medical problem, hunger is a social problem, complicated by the fact that the hungry are also subject to various other noxious social conditions. The negative effect of moderate malnutrition may stem from apathy in learning and other situations which relate to life success.
Kallen DJ. Nutrition and Society. JAMA. 1971;215(1):94–100. doi:10.1001/jama.1971.03180140058010
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