Insulin Sensitivity

Insulin Sensitivity

Insulin sensitivity is how well the body’s tissues respond to insulin, the main hormone that moves glucose from the blood into cells. When sensitivity is high, a fairly small amount of insulin keeps blood sugar normal after meals and during fasting. When it falls (insulin resistance), the pancreatic beta cells have to make more and more insulin to get the same effect, until they can no longer keep up and type 2 diabetes develops.

Many factors affect insulin sensitivity, including body composition (especially visceral fat), physical activity, genes, age and hormones. Visceral fat is particularly harmful because it releases inflammatory cytokines and free fatty acids that directly weaken insulin signaling in the liver and skeletal muscle. That is why weight loss is one of the most effective ways to improve insulin sensitivity: even a 5–7% drop in body weight brings clinically meaningful gains in how well insulin clears glucose.

Retatrutide improves insulin sensitivity both directly and indirectly. Weight loss shrinks visceral fat and the inflammation it causes, restoring more normal insulin signaling. GLP-1 and GIP receptor activation directly boosts glucose-dependent insulin release from beta cells, easing the load on the insulin signaling system. Glucagon receptor activity clears fat from the liver, which reduces insulin resistance there. In Phase 2 trials, these combined effects showed up as large HbA1c reductions and improvements in fasting insulin and HOMA-IR scores across all dose groups.