How Our Hormones Control Our Hunger, Eating & Satiety

April 19, 2021hormones nutrition neuroscience health

TL;DR

Hormones from the gut, liver, pancreas, and brain control appetite and satiety through specific signaling pathways that can be deliberately manipulated
Brain areas like the hypothalamus and specific neuron populations such as POMC neurons regulate both the desire to eat and the desire to stop eating
A hormone regulated by UV rays from sunlight reduces appetite, highlighting the importance of light exposure for metabolic health
The timing of eating controls appetite hormones more than appetite controls eating, allowing strategic meal timing to regulate hunger
Fatty acid and amino acid thresholds in the gut determine satiety levels, and understanding these mechanisms reveals why people often overeat
Practical tools including specific supplements, exercise timing, meal composition, and strategies like triggering CCK release can optimize hunger hormones

Key Moments

0:00

Introduction to hormonal control of appetite and satiety

12:00

Brain areas and neural populations regulating hunger and fullness signals

25:00

Sunlight, UV rays, and the hormone that suppresses appetite

38:00

How meal timing controls appetite hormones and fatty acid thresholds

52:00

Practical tools, supplements, and strategies to regulate hunger hormones

Episode Recap

This episode explores the intricate hormonal systems that govern hunger, eating behavior, and satiety. Dr. Huberman explains how hormones produced by the gut, liver, pancreas, and brain work together to regulate appetite and food intake. The hypothalamus serves as the central command center, containing specific neuronal populations including POMC neurons, which influence both the desire to eat and the desire to stop eating.

A fascinating discussion focuses on a hormone regulated by ultraviolet rays from sunlight that naturally reduces appetite. This connection between light exposure and metabolic hormones underscores the importance of sun exposure for overall health beyond just vitamin D production.

The episode challenges the common assumption that appetite drives eating behavior. Instead, Huberman explains that when we eat actually controls our appetite hormones. By strategically timing meals, we can leverage our natural hormonal rhythms to achieve specific nutritional and body composition goals. This insight has profound implications for how we approach daily eating patterns.

Huberman describes how the body operates on a threshold system where satiety is triggered by reaching specific levels of fatty acids and amino acids in the gut. Various factors can alter this signaling system, causing people to consume far more food than their body actually needs. Understanding what disrupts these signals is crucial for addressing overeating and metabolic dysfunction.

The episode covers the relationship between insulin, glucose, and glucagon, explaining how these hormones interact to regulate energy metabolism and blood sugar stability. Cholesterol emerges as surprisingly important for ovary, adrenal, liver, and testicular function, challenging the oversimplified view that all cholesterol is harmful.

A significant portion addresses how the ketogenic diet affects glucose levels and thyroid function, providing context for those considering dietary approaches to metabolic health. The episode emphasizes that thyroid hormone warrants its own dedicated discussion.

The practical tools section is comprehensive, including specific supplement recommendations from sponsors like Thorne, particular types and timing of exercise to regulate hormones, strategic meal timing approaches, and specific eating patterns designed to optimize appetite hormones. One innovative strategy involves triggering the release of CCK, a hormone that promotes satiety, through specific dietary choices.

Huberman clarifies a pronunciation note from the episode, explaining that POMC stands for proopiomelanocortin, addressing a verbal misstep where he initially mispronounced it as P-M-O-C. This transparency about corrections maintains scientific accuracy throughout the discussion.