
In the 1970s, scientists first uncovered the “incretin effect,” – the discovery that the gut sends hormonal signals after you eat that boost insulin more than intravenous glucose. This was the foundational moment showing that digestion and hormone release are intimately linked to blood sugar control, setting the stage for decades of metabolic hormone research.
Pivotal Research: Early studies demonstrated that oral glucose prompted 50–70% more insulin secretion than the same amount given intravenously, indicating the presence of gut-derived incretins.
Key Insight: This effect explains why eating carbohydrates feels satisfying. Your body naturally increases insulin through gut signaling, a process later amplified by GLP-1 therapies.



















