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Carnivore diet effects on autophagy mytophagy
The carnivore diet's relationship with autophagy is genuinely contested terrain. High protein chronically activates mTORC1, the master autophagy suppressor, which in mainstream and alternative frameworks alike should dampen cellular recycling. Yet ketosis, achieved even on carnivore, may partially counteract this via AMPK and BHB-mediated pathways. The mitophagy picture is more nuanced — carnivore's forcing of near-exclusive mitochondrial fat oxidation may select for mitochondrial quality pressure independent of classical autophagy flux. Claims that carnivore robustly upregulates autophagy remain speculative.
Evidence
- Peter Attia and Paul Saladino have both noted the mTOR tension explicitly: carnivore's protein load — typically well above 1.5g/kg — chronically signals through leucine and branched-chain amino acids to mTORC1, suppressing the Beclin-1/ULK1 autophagy initiation cascade.
- Frontiers in Nutrition (Feb 2026) published editorial evidence that low-carbohydrate, high-fat diets can modulate autophagy and endoplasmic reticulum stress pathways, lending partial support to ketosis-driven autophagy independent of protein load.
- Mitophagy specifically falls under PINK1/Parkin pathway regulation, which responds to mitochondrial membrane potential collapse rather than nutrient sensing alone.
- This is distinct from classical LC3B-mediated autophagy flux and operates at the level of mitochondrial membrane physics rather than mTOR signaling.
- Saladino later moderated his carnivore position partly over anabolic/catabolic balance concerns, though he never fully abandoned animal-based eating.