The Science · Plain English

Your hunger hormones, explained

Hunger and fullness feel like willpower, but underneath they're a chemical conversation between your gut, your fat cells, and your brain. A small cast of hormones runs the whole thing. Meet them — who says "eat," who says "enough," and how they work together — plainly, and with sources.

Salmon Peptides · Reviewed against published research · Educational, not medical advice · Last updated August 2026

The short answer

Two hormones dominate the headline: ghrelin, the "hunger hormone" from your stomach that rises before meals and tells your brain to eat, and leptin, the "fuel-gauge" hormone from your fat cells that signals how much energy you have stored.1 After you eat, your gut releases the fullness team — GLP-1, PYY and CCK — which quiet appetite through the gut-brain axis.2 Hunger is the balance between them.

On this page

  1. The cast of hunger hormones
  2. Ghrelin — the "eat now" signal
  3. Leptin — the fuel gauge
  4. GLP-1, PYY & CCK — the fullness team
  5. How they work together
  6. Where salmon peptides fit
  7. The honest limits
  8. Common questions

The cast of hunger hormones

Appetite is regulated by "crosstalk between the gut and the brain through the gut-brain axis."2 The players fall into two camps: orexigenic (appetite-raising) and anorexigenic (appetite-lowering). Ghrelin is essentially the only major orexigenic one; the rest — GLP-1, GIP, CCK, PYY, plus leptin and insulin — push the other way.2

"Hunger isn't a character flaw. It's a signal — sent by hormones you can influence with how you eat, move and sleep."

The hunger and fullness hormones: ghrelin from the stomach raising appetite, leptin from fat cells signaling energy stores, and GLP-1, PYY and CCK from the gut lowering appetite through the gut-brain axis
Ghrelin (stomach) raises appetite; leptin (fat cells) reports energy stores; GLP-1, PYY and CCK (gut) signal fullness — all talking to the brain. Conceptual illustration.

Ghrelin — the "eat now" signal

Ghrelin is the body's main hunger hormone, produced mostly in the stomach. Its levels climb before meals and fall after eating, and it acts on appetite centers in the brain (the hypothalamus) to drive the urge to eat.1 It's the voice that says "I'm hungry — go find food."

Leptin — the fuel gauge

Leptin is released by your fat cells and works as a long-term adiposity signal — a readout of how much energy you have stored.3 When stores are ample, leptin rises and helps signal "enough"; when energy is scarce, leptin falls and hunger increases. In excess weight, the body can stop responding well to it ("leptin resistance"), which is part of why appetite gets harder to read.1

GLP-1, PYY & CCK — the fullness team

When food arrives, gut cells release the short-term satiety signals:

These reach the brain through the bloodstream and the vagus nerve to turn appetite down.2

How they work together

Hunger is the running balance of these signals. Ghrelin pushes you to eat; leptin sets the background based on your energy stores; and after a meal the gut's fullness team pushes back. Diet shapes the whole system — a systematic review of randomized trials found that higher protein intake meaningfully shifts these appetite hormones (lowering ghrelin, raising GLP-1 and PYY),4 which is why what and how you eat changes how hungry you feel later.

Where salmon peptides fit

Here's the honest connection to what we do. Beyond whole food, specific food-derived and marine peptides have been studied for supporting the same fullness signaling this cast relies on. A review catalogs food proteins and peptides for their effect on satiety,5 and in laboratory gut-cell work fish protein hydrolysates increased the body's own GLP-1 secretion.6 The idea isn't to override your hormones — it's to support the natural fullness signals your body already sends.

Support your fullness signals

triGLP is bioactive salmon peptides in four clean, sublingual ingredients — made to help support the natural GLP-1 satiety signaling your body already uses, not to override your hormones.

See the triGLP drops

// ships from the official ORYGN storefront · dietary supplement · not a drug · results vary

Straight talk

The honest limits

This is educational biology, not medical advice, and not guidance for treating obesity or any condition — that's between you and your doctor. Appetite is complex: genetics, sleep, stress, medications and your whole diet all shape these hormones, and individual responses vary. Salmon peptides are a dietary supplement, not a medicine — they don't treat, cure, or prevent any disease and won't override your hormones. The research on food-derived salmon and fish peptides is still early, much of it in cell and animal models, so encouraging findings are not a promise for any one person. We link the studies so you can judge for yourself.

Common questions

What are the main hunger hormones?

The headline hunger hormone is ghrelin (from the stomach, raises appetite). Working against it are leptin (from fat cells, a long-term energy-stores signal) and the gut's post-meal fullness hormones — GLP-1, PYY and CCK. Hunger is the balance between the appetite-raising and appetite-lowering signals. Results vary by person.

What's the difference between ghrelin and leptin?

Ghrelin is the short-term "hunger hormone" — it rises before meals and tells your brain to eat. Leptin is the long-term "fuel gauge" from your fat cells that reports how much energy you have stored; higher stores raise leptin and help signal "enough." They pull in opposite directions. In excess weight the body can respond poorly to leptin ("leptin resistance").

Can I change my hunger hormones naturally?

Diet and lifestyle shift them. Research shows higher protein intake lowers ghrelin and raises fullness hormones like GLP-1 and PYY; fiber, adequate sleep and regular activity also support healthier appetite signaling. It's influence, not total control — genetics and other factors matter, and results vary.

Do peptide supplements affect hunger hormones?

Certain food-derived peptides, including fish and marine protein hydrolysates, have been studied for supporting the same satiety hormones (like GLP-1) that whole protein triggers. The research is still early and mostly in lab models, so it's support of normal fullness signaling — not a cure or a way to override your hormones — and results vary.

Keep reading
Metabolic peptides →
The peptide hormones that run your metabolism — incretins, insulin, glucagon. Cited.
How to feel full longer →
The evidence-based levers that shift these hunger hormones in your favor.

References

  1. The role of leptin and ghrelin in the regulation of appetite in obesity. Review, 2025. pubmed.ncbi.nlm.nih.gov/39983918
  2. Gut hormones and appetite regulation. Review, 2024. pubmed.ncbi.nlm.nih.gov/38511400
  3. Regulation of energy balance by leptin as an adiposity signal and modulator of the reward system. Review, 2024. pmc.ncbi.nlm.nih.gov/articles/PMC11696864
  4. Effect of short- and long-term protein consumption on appetite and appetite-regulating gastrointestinal hormones: a systematic review and meta-analysis of randomized controlled trials. British Journal of Nutrition, 2020. pubmed.ncbi.nlm.nih.gov/32768415
  5. Proteins and Peptides from Food Sources with Effect on Satiety and Their Role as Anti-Obesity Agents: A Narrative Review. Nutrients, 2024. ncbi.nlm.nih.gov/pmc/articles/PMC11510221
  6. Blue Whiting Protein Hydrolysates Increase GLP-1 Secretion and Proglucagon Production in STC-1 Cells. Nutrients, 2022. ncbi.nlm.nih.gov/pmc/articles/PMC8877066