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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Effects of oral fructose and glucose on plasma GLP-1 and appetite in normal subjects.
Peptides 1999
Oral glucose is a potent stimulant of glucagon-like peptide-1 (GLP-1) secretion. The effect of oral fructose on GLP-1 secretion in humans is unknown. The aims of this study were to determine (i) whether oral fructose stimulates GLP-1 secretion and (ii) the comparative effects of oral glucose and fructose on appetite. On 3 separate days, 8 fasting healthy males received, in single-blind randomized order (i) 75 g glucose, (ii) 75 fructose, or (iii) 75 g glucose followed by 75 g fructose I h later. Venous glucose, insulin and GLP-1 were measured. Appetite was assessed by visual analog questionnaires and intake of a buffet meal. Whereas glucose and fructose both increased plasma glucose, insulin and GLP-1 (P < 0.000)] for all), the response to glucose was much greater (P < 0.005 for all). There was no increase in plasma GLP-1 when fructose was given after glucose. There was no difference in food intake after oral glucose or fructose. We conclude that oral fructose (75 g) stimulates GLP-1 (and insulin) secretion, but the response is less than that to 75 g glucose. These observations suggest that neither GLP-1 nor insulin play a major role in the regulation of satiation.
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