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Glucose Production, Uptake Decline During Fast Is Blunted In Obese Women.
2001 APR 26 - (NewsRx Network) -- by Susan Hasty, staff medical writer - The normal decline in glucose production and uptake during temporary fasting is apparently blunted in the obese, as is the expected decline in circulating concentrations of both insulin and leptin, researchers say.
This blunting effect may explain "some of the differences in metabolic responses to fasting observed between lean and abdominally obese persons," said Jeffrey F. Horowitz and colleagues at the Washington University School of Medicine, St. Louis, Missouri, and St. Bartholomew's and The Royal London School of Medicine, London.
Horowitz and associates analyzed glucose metabolism for differences after 14 and 22 hours fasting in lean and obese women. They measured whole-body glucose metabolism using a stable-isotope tracer, and glucose uptake in abdominal fat tissue by arteriovenous balance. Their subjects were seven lean (body mass index, BMI = 21 [+ or -] 5 kg/[m.sup.2]) and six abdominally obese (BMI = 36 [+ or -] 1 kg/[m.sup.2]) women.
During fasting, glucose production and disposal fell in both groups of women, but it fell 50% more (p[less than]0.05) in the lean women than the obese ("Whole-body and adipose tissue glucose metabolism in response to short-term fasting in lean and obese women," American Journal of Clinical Nutrition, March 2001;73(3):517-522).
Similarly, the decline in glucose uptake after 22 hours of fasting was greater in the lean women (0.26 [+ or -] [micro]mol/100 g/min) than ...
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Source: HighBeam Research, Glucose Production, Uptake Decline During Fast Is Blunted In Obese...