Document Detail

Fast foods, energy density and obesity: a possible mechanistic link.
MedLine Citation:
PMID:  14649369     Owner:  NLM     Status:  MEDLINE    
Fast foods are frequently linked to the epidemic of obesity, but there has been very little scientific appraisal of a possible causal role. Here we review a series of studies demonstrating that the energy density of foods is a key determinant of energy intake. These studies show that humans have a weak innate ability to recognise foods with a high energy density and to appropriately down-regulate the bulk of food eaten in order to maintain energy balance. This induces so called 'passive over-consumption'. Composition data from leading fast food company websites are then used to illustrate that most fast foods have an extremely high energy density. At some typical outlets the average energy density of the entire menus is approximately 1100 kJ 100 g(-1). This is 65% higher than the average British diet (approximately 670 kJ 100 g(-1)) and more than twice the energy density of recommended healthy diets (approximately 525 kJ 100 g(-1)). It is 145% higher than traditional African diets (approximately 450 kJ 100 g(-1)) that probably represent the levels against which human weight regulatory mechanisms have evolved. We conclude that the high energy densities of many fast foods challenge human appetite control systems with conditions for which they were never designed. Among regular consumers they are likely to result in the accidental consumption of excess energy and hence to promote weight gain and obesity.
A M Prentice; S A Jebb
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Obesity reviews : an official journal of the International Association for the Study of Obesity     Volume:  4     ISSN:  1467-7881     ISO Abbreviation:  Obes Rev     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-11-27     Completed Date:  2004-03-23     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  100897395     Medline TA:  Obes Rev     Country:  England    
Other Details:
Languages:  eng     Pagination:  187-94     Citation Subset:  IM    
MRC International Nutrition Group, London School of Hygiene and Tropical Medicine, UK.
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MeSH Terms
Appetite Regulation / physiology
Dietary Fats / administration & dosage*
Energy Intake*
Food Analysis
Great Britain / epidemiology
Nutritive Value
Obesity / epidemiology*,  etiology*
Reg. No./Substance:
0/Dietary Fats

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