External non-physiological factors modulate physiologically derived hunger and satiety signals. Non-physiological factors such as hedonic (palatability, taste, texture, odour), social (culture, religion), psychological (preferences, aversions, emotions, dieting behaviour), environmental (temperature, time of day, other people), economic (cost, availability) and pharmacological (anorectants) factors influence food intake. The extent to which different individuals respond to these various factors may vary markedly. This may explain some discrepancies among human food intake studies, and some reports of high between-subject variability.
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