Frail older people have less of the hunger hormone in their blood even before they eat, which might make them less interested in food.

Older people don’t feel hungry after eating because their body doesn’t release the right hunger hormone the way younger people do.

Even though undernourished older women have more of the hunger hormone in their blood, they still don’t eat more—so high hunger signals don’t always make people eat.

Older women who aren't eating enough feel less hungry than younger women, even though their bodies are making more of the hunger hormone, which might explain why they eat less as they age.

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.

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.