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Home / Science

The science of appetite hormones

James T.

Written by James T.

Published January 28, 2026

The science of appetite hormones

Hunger isn't willpower. It's hormones. Understanding the main ones — and what they respond to — takes so much self-blame off the table.

HormoneRoleWhat affects it
GhrelinHunger signalEmpty stomach, poor sleep
LeptinFullness signalFat tissue, sleep, inflammation
GLP-1Satiety + insulinMeals, fiber, protein
InsulinEnergy storageCarbs, exercise, sleep
CortisolStress + hungerStress, poor sleep
The main cast

Did you know?

Sleep is a hormone regulator

One bad night of sleep can raise ghrelin and lower leptin the next day — independent of what you eat. It's not willpower. It's chemistry.

Want to work with your biology, not against it?

A licensed provider can help.

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Sources & disclosures

  1. This page is informational only, is not medical advice, and does not guarantee any specific outcome. Always consult your licensed provider.
  2. Compounded medications are prepared by state-licensed U.S. compounding pharmacies and are not FDA-reviewed.

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