Abstract
Choice of diet is a combination of socioeconomic, psychological, and biological factors. This article reports on a preliminary study using an animal model and approximating the dietary conditions found on some Native American reservations. The results suggest that alcohol consumption in these disadvantaged populations may be a result of tryptophan deficiency. Tryptophan-deficient rats consumed more alcohol under ad-libitum conditions, perhaps to compensate for the lack of this essential amino acid. Tryptophan is the biological precursor of serotonin, a central neurotransmitter that has been implicated in mood elevations and declines. Alcohol has been found to mimic the effects of tryptophan or serotonin. We suggest that alcohol consumption may act to compensate for the dietary deficiency of this amino acid. The model attributing alcohol consumption to tryptophan deficiency thus connects socioeconomic, psychological, and biological factors.
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