mTORiX›BCAA Restriction (Branched-Chain Amino Acid Restriction)
Intervention · Evidence map

BCAA Restriction (Branched-Chain Amino Acid Restriction)

Combined reduction of all three branched-chain amino acids (leucine, isoleucine, valine) in the diet, studied for sex-specific lifespan effects in mice.

Class: Dietary amino-acid-class restriction (leucine + isoleucine + valine, restricted together as the branched-chain amino acid class)Lit. search: 2026-07-11v0.2.0-mvp
Reviewed by Nabus Research · last reviewed 2026-07-11 · about our review process
Human lifespan evidence: none

Classification

Intervention class: Dietary amino-acid-class restriction (leucine + isoleucine + valine, restricted together as the branched-chain amino acid class)

Aliases: Branched-chain amino acid restriction, Combined leucine/isoleucine/valine restriction

Relationship to mTOR: Leucine is a well-characterized direct activator of mTORC1 via Sestrin2-GATOR2/GATOR1-Rag signaling (see /rag-gtpases upstream, /s6k1 downstream). Restricting the combined BCAA class reduces this input. Stored as a SEPARATE entity from isoleucine-only restriction (/isoleucine-restriction) and from total protein restriction (/protein-restriction) -- see datamodel warning.

Mechanism summary: Combined reduction of all three branched-chain amino acids (leucine, isoleucine, valine) in the diet, studied for sex-specific lifespan effects in mice.

Regulatory status

Dietary intervention; not a drug. No regulatory approval framework applies.

Evidence per species / population (5-qualifier claim format)
Mouse (dietary BCAA restriction, sex-specific lifespan study)   Tier 6 · Single-lab animal lifespan verification: verified_2026-07-11
1. Species / populationMice, dietary BCAA-restriction lifespan study
2. Exposure, route, scheduleDietary BCAA (leucine+isoleucine+valine) content reduced by approximately 67% relative to control diet
3. Comparator & durationStandard-BCAA control diet; lifespan follow-up
4. Endpoint & numeric resultMedian lifespan increased by MORE THAN 30% in MALE mice; this effect was NOT observed in female mice
5. What this study did NOT establishA sex-by-diet interaction is the core finding, not a uniform effect -- this cannot be generalized across sexes even within the mouse model, let alone extrapolated to humans. Did not test humans or any human dose.
Linked study record: BCAA / isoleucine restriction mouse lifespan study (sex-specific)
Negative / null / conflicting findings

The +30% median lifespan effect was male-specific in mice; no female lifespan benefit was observed at the same ~67% BCAA reduction. [study record] verification: verified_2026-07-11

Safety

Safety notes

No established human BCAA-restriction longevity dose exists. BCAA restriction has separately been studied in specific clinical-metabolic-disease contexts (e.g. management of maple syrup urine disease), which is a distinct clinical question this longevity-evidence page does not address.

Source: (not applicable (no drug label; dietary intervention)) verification: verified_2026-07-11

Editorial policy: This site publishes no BCAA-restriction dosing calculator and no self-directed protocol.

Data model warning: Combined BCAA restriction (this page), isoleucine-only restriction (/isoleucine-restriction), and total dietary protein restriction (/protein-restriction) are stored as three SEPARATE intervention entities. These exposures are not interchangeable and their effect sizes must never be summed or averaged across entities.

Funding / conflict of interest

Funding sources and conflict-of-interest disclosures for individual studies are not reproduced here pending primary-source verification; see each linked study record.

Related study records
BCAA / isoleucine restriction mouse lifespan study (sex-specific)
Tier 6 · Mus musculus
Solon-Biet nutritional geometric framework (25-diet mouse study)
Tier 6 · Mus musculus
Version 0.2.0-mvp · literature search date 2026-07-11 · editorial owner Nabus Research