How your brain knows when you’ve eaten enough protein
Rapid sensing of l-leucine by human and murine hypothalamic neurons: Neurochemical and mechanistic insights
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When you eat protein, a building block called leucine floats in your blood. Your brain has special neurons that can feel leucine directly — like a taste sensor — and they tell you to stop eating.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
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Max 30Expert Opinion & Narrative Reviews
Max 557 / 58
Evidence Score
Researchers compare people who have a condition (cases) with similar people who do not (controls), looking back in time for differences in exposure. Useful but more prone to bias.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When you eat protein, a building block called leucine floats in your blood. Your brain has special neurons that can feel leucine directly — like a taste sensor — and they tell you to stop eating.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 557 / 58
Evidence Score
Researchers compare people who have a condition (cases) with similar people who do not (controls), looking back in time for differences in exposure. Useful but more prone to bias.
Publication
Authors
Heeley N, Kirwan P, Darwish T, Arnaud M, Evans ML, Merkle FT, Reimann F, Gribble FM, Blouet C
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Claims (6)
Leucine binds to a specific calcium channel on POMC neurons in the brain, causing these neurons to activate and send signals that reduce food intake.
Exposure to the amino acid L-leucine at physiological concentrations triggers rapid changes in calcium levels within specific neurons in the hypothalamus of humans and mice, activating 25% of POMC neurons and inhibiting 10% of NPY/AGRP neurons, which directly affects the regulation of energy balance.
L-leucine activates specific neurons in the hypothalamus by triggering calcium entry through the cell membrane, without requiring the cell to metabolize it or use known signaling pathways like mTORC1 or KATP channels.
L-leucine reduces activity in specific brain neurons by blocking a type of calcium flow that depends on SERCA ATPase and 2-APB, and this mechanism is different from the calcium pathway that normally activates these neurons.
L-leucine triggers similar rapid responses in appetite-regulating brain cells of humans and mice, with the same proportion of key neuron types reacting in both species.