Incretin and Islet Hormone Responses to Meals of Increasing Size in Healthy Subjects
Abstract
CONTEXT: Postprandial glucose homeostasis is regulated through the secretion of glucagon-like peptide 1 (GLP-1) through the stimulation of insulin secretion and inhibition of glucagon secretion. However, how these processes dynamically adapt to demands created by caloric challenges achieved during daily life is not known. OBJECTIVE: The objective of the study was to explore the adaptation of incretin and islet hormones after mixed meals of increasing size in healthy subjects. DESIGN: Twenty-four healthy lean subjects ingested a standard breakfast after an overnight fast followed, after 4 hours, by a lunch of a different size (511, 743, and 1034 kcal) but with identical nutrient composition together with 1.5 g paracetamol. Glucose, insulin, C-peptide, glucagon, intact GLP-1, and glucose-dependent insulinotropic polypeptide (GIP) and paracetamol were measured after the meals. MAIN OUTCOME MEASURE: Area under the 180-minute curve (AUC) for insulin, C-peptide, glucagon, GLP-1, and GIP and model-derived β-cell function and paracetamol appearance were calculated. RESULTS: Glucose profiles were similar after the two larger meals, whereas after the smaller meal, there was a postpeak reduction below baseline to a nadir of 3.8 ± 0.1 mmol/L after 75 minutes (P < .001). The AUC for GLP-1, GIP, insulin, and C-peptide were significantly higher by increasing the caloric load as was β-cell sensitivity to glucose. In contrast, the AUC glucagon was the same for all three meals, although there was an increase in glucagon after the postpeak glucose reduction in the smaller meal. The 0- to 20-minute paracetamol appearance was increased by increasing meal size. CONCLUSION: Mixed lunch meals of increasing size elicit a caloric-dependent insulin response due to increased β-cell secretion achieved by increased GIP and GLP-1 levels. The adaptation at larger meals results in identical glucose excursions, whereas after a lower caloric lunch, the insulin response is high, resulting in a postpeak suppression of glucose below baseline.
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- Authors
- Alsalim, W., Omar, B., Pacini, G., Bizzotto, R., Mari, A., & Ahrén, B.
- Affiliations
- Lund University (SE)
- National Research Council (IT)
- Venue
- The Journal of Clinical Endocrinology & Metabolism
- Publisher
- The Endocrine Society
- Published
- 2015-02
- Volume
- 100
- Issue
- 2
- Pages
- 561-568
- ISSN
- 0021-972X (ISSN-L)
- 1945-7197
- OpenAlex
- W2101365494
- Cited by
- 33
- References
- 42
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 4 · 2021: 1 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 1
- FWCI
- 4.62
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
- PubMed (publishedVersion)
- CNR ExploRA (submittedVersion)
- Lund University Publications (Lund University) (submittedVersion)
- Topics
- Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Keywords
- incretins, islet hormones, glucagon-like peptide-1, glucose-dependent insulinotropic polypeptide, insulin secretion, beta-cell function, glucagon, C-peptide, meal size, mixed meal
- MeSH terms
- Adult, Blood Glucose, C-Peptide, Female, Gastric Inhibitory Polypeptide, Glucagon, Humans, Insulin, Male, Postprandial Period, Glucagon-Like Peptide 1, Young Adult, Meals, Healthy Volunteers
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