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Effects of extreme environments on food intake in human subjects

Published online by Cambridge University Press:  28 February 2007

Margriet S. Westerterp-Plantenga
Margriet S. Westerterp-Plantenga*
Affiliation:
Department of Human Biology, Maastricht University, PO Box 616, 6200 MD Maastricht, The Netherlands
*
Corresponding Author: fax +31 43 3670976, email M.Westerterp@HB.Unimaas.nl
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Abstract

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Effects of extreme environments on food intake in human subjects are analysed as behavioural and physiological adaptations to annual and circadian rhythms, temperature and altitude. Effects of the environment on food intake through food availability have direct consequences on energy balance and body weight. Different geographical regions show variations in the composition of dietary foods, i.e. the relative proportions of carbohydrate, protein and fat. In developing countries the annual cycle appears to affect body weight through dependence on food availability. In West-European countries this effect appears to depend on physical activity. Energy and macronutrient intakes appear to follow a circadian pattern, with breakfast being relatively high in carbohydrate and dinner being relatively high in fat. In cold conditions, maintaining an adequate food intake is important in sustaining normal physiological responses to cold. Evidence for a possible cold-induced increase in appetite is poor. A condition influencing level of intake is the palatability of the food. High altitude, i.e. hypobaric hypoxia, appears to reduce appetite, energy intake and body mass, irrespective of acute mountain sickness (AMS). Meal size is reduced and meal frequency increased. Under circumstances of AMS, dissociation between appetite and hunger occurs. Thus, spontaneous adaptation to extreme environments requiring increased energy intake occurs first by adaptation of body weight to a new energy balance. In general, prevention of a negative energy balance occurs by learning with respect to food intake. After return to normal, adjustment of energy intake to the original energy balance occurs with restoration of body weight.

Keywords

Energy balanceHypobaric hypoxiaMacronutrientsSeasonal effects
Type
Symposium on ‘Social and environmental influences on diet choice’
Information
Proceedings of the Nutrition Society , Volume 58 , Issue 4 , November 1999 , pp. 791 - 798
Copyright
The Nutrition Society

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