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A three week low calorie diet significantly reduced both total plasma tryptophan and the ratio of tryptophan to competing amino acids in a group of 15 healthy volunteers. Despite a similar percentage weight loss the reduction in plasma tryptophan was greater in women than men. In addition, only in women was dieting associated with increased prolactin secretion following intravenous tryptophan, a measure of brain 5-hydroxytryptamine (5-HT) function. These results suggest that dieting reduces the availability of circulating tryptophan for brain 5-HT synthesis. Women appear more vulnerable than men both to this effect and to its consequences for brain 5-HT function. Altered brain 5-HT function may play a part in some of the psychological consequences of dieting, including the development of clinical eating disorders.

Type

Journal article

Journal

Psychol Med

Publication Date

11/1990

Volume

20

Pages

785 - 791

Keywords

Adult, Amino Acids, Branched-Chain, Body Mass Index, Brain, Diet, Reducing, Energy Intake, Female, Humans, Prolactin, Serotonin, Tryptophan