After following diets for 18 months, men's hunger hormone levels went up slightly while women's went down, showing a clear gender difference in how the body responds to dieting.

After following different diets for 18 months, people who ate a green-MED diet (with extra plant-based shakes and green tea) had a bigger increase in their hunger hormone levels compared to those on standard healthy eating guidelines.

After losing weight, people on very low-carb diets have higher levels of the hunger hormone ghrelin than those on high-carb diets, which might make them feel hungrier.

The hunger hormone ghrelin doesn’t seem to affect how the body burns fat vs. carbs after eating, how active someone is, how fit they are, or their eating habits like restraint or hunger feelings.

In men with excess belly fat and metabolic issues, a rise in hunger hormone levels was linked to better blood sugar control, higher 'good' cholesterol, and reduced belly fat, even after accounting for how much weight they lost.

People with more belly fat and metabolic issues tend to have lower levels of a hunger hormone called ghrelin, which is linked to higher fat in the liver, more leptin (a fullness hormone), and higher blood pressure.