Effect of small intestinal nutrient infusion on appetite, gastrointestinal hormone release, and gastric myoelectrical activity in young and older men

The American Journal of Gastroenterology
C G MacIntoshIan M Chapman

Abstract

The mechanisms responsible for the reduction in appetite and slowing of gastric emptying in older persons are poorly understood. The aim of this study was to evaluate the effects of aging on small intestinal regulation of appetite, GI hormone release, and gastric myoelectrical activity. Thirteen older (65-84 yr) and 13 young (18-32 yr) healthy men received isovolumetric, intraduodenal (i.d.) infusions of saline (control), lipid, and glucose for 120 min, on separate days. The energy content of the lipid and glucose infusions was identical at 2.86 kcal/min. Immediately after the i.d. infusions, each subject was offered a buffet meal, and ad libitum food intake was quantified. Blood glucose and plasma insulin, glucagon-like peptide 1, and glucose-dependent insulinotropic peptide were measured. Gastric myoelectrical activity was measured by surface electrogastrography (EGG). I.d. lipid suppressed food intake in both the young and older men (p < 0.05), whereas i.d. glucose suppressed food intake only in the older men (p < 0.05). The blood glucose (p < 0.01) and insulin (p < 0.05) responses to i.d. glucose were greater in older than young men. However, there were no differences in glucagon-like peptide 1 or glucose-dependent insulino...Continue Reading

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