Postprandial plasma ghrelin is suppressed proportional to meal calorie content in normal-weight but not obese subjects - PubMed (original) (raw)
. 2005 Feb;90(2):1068-71.
doi: 10.1210/jc.2004-1216. Epub 2004 Nov 2.
Affiliations
- PMID: 15522935
- DOI: 10.1210/jc.2004-1216
Postprandial plasma ghrelin is suppressed proportional to meal calorie content in normal-weight but not obese subjects
C W le Roux et al. J Clin Endocrinol Metab. 2005 Feb.
Abstract
Circulating levels of the gastric hormone ghrelin rise before and decrease after a meal. In normal-weight subjects, postprandial suppression of ghrelin is proportional to calories consumed. Obese individuals have lower fasting ghrelin levels; however, it is unclear whether the obese show normal postprandial suppression. This study aimed to compare postprandial ghrelin responses in normal-weight and obese subjects, using mixed macronutrient meals with varied fat and calorie content. Postprandial ghrelin response was measured in normal-weight insulin-sensitive subjects and obese insulin-resistant subjects, after six test meals with different fat and calorie content (250-3000 kcal). Increasing the calorie content of meals in normal-weight subjects progressively lowered nadir levels of ghrelin. The obese had lower fasting ghrelin levels, and the reduction after the consumption of all test meals was less than the normal-weight subjects. The lowest postprandial levels in the obese were no different to the nadir in normal-weight volunteers after 1000-, 2000-, and 3000-kcal meals. Thus, circulating ghrelin levels decreased in normal-weight subjects after mixed meals. Obese subjects demonstrated a much reduced ghrelin postprandial suppression. This reduced suppression may influence satiety, thus reinforcing obesity.
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