This Brain Chemical Is Why You’re Addicted to Junk Food | TUH #198

4 Sept 2025 · 10 min
9:41

A podcast episode (Ultimate Human Podcast, host Gerry Breher) explaining research on dynorphins — endogenous peptides that bind kappa-opioid receptors (KORs) — and how they influence eating behaviour. The speaker reviews animal studies showing that brain injection of certain dynorphins raises food intake without affecting locomotion/rest, and that dynorphin-knockout mice fed high‑fat diets became heavier than controls despite equal or lower intake, implying effects on energy metabolism. The episode links dynorphin/KOR signalling to impulsive eating and reward circuitry (interaction with dopamine, acetylcholine, glutamate), describes how ultraprocessed foods can hijack this system to produce cycles of craving and dysphoria, and highlights KOR blockade as a promising therapeutic approach to reduce binge/compulsive eating. It closes with a listener CTA to join a VIP community.

Questions this video answers

Kappa-opioid receptors (KORs).

It increased food intake without altering other activities such as locomotion or resting.

They became heavier than normal mice despite eating the same amount or in some cases less.

Blockade (pharmacological inhibition) of kappa-opioid receptors.

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