Delayed gastric emptying and increased inflammation in diabetes impair nutrient absorption and appetite, making weight gain difficult.

Diabetes can slow the rate at which food leaves the stomach, leading to early satiety and reduced overall intake even when attempting to eat more. Chronic low‑grade inflammation associated with obesity and insulin resistance further interferes with hunger hormones and nutrient utilization. These gastrointestinal and metabolic changes diminish the efficiency of calorie absorption, so extra food does not translate into weight gain.