Macronutrient ratio
Ratio of protein:carbohydrate:fat in the diet; affects mTOR activation independently of total caloric intake.
The balance of protein, carbohydrate, and fat in the diet. Changing this ratio can switch mTOR activity up or down independently of how many total calories are eaten.
Ratio of protein:carbohydrate:fat in the diet; affects mTOR activation independently of total caloric intake.
TL;DR. Macronutrient ratio appears in 3 curated studies in Oliver's mTOR Atlas: 1 in people (1 human study); 1 in animal models; 1 review.
Evidence at a glance
| Evidence | What it means | Studies |
|---|---|---|
| H | Human study | 1 |
| A | Animal model | 1 |
| R | Review — secondary literature, not a new result | 1 |
Studies
| Year | Evidence | Study |
|---|---|---|
| 2026 | H | Reduced dietary protein intake does not alter autophagy in human blood: A randomized crossover study in healthy adults SIN2026 In a rigorous randomized crossover trial, 63 healthy adults completed both a normal-protein (20% energy) and a reduced-protein (10% energy) diet for 4 weeks each. Despite preclinical evidence that dietary protein restriction should activate autophagy via mTORC1 inhibition, directly measured autophagic flux in blood immune cells did not change between the two diets. This is one of the few human studies to test the protein-restriction-to-autophagy link with a dynamic, flux-based (not just steady-state marker) readout, and the negative result suggests that moderate protein reduction alone, without an accompanying caloric deficit, is not sufficient to engage autophagy in humans the way it does in some animal models. |
| 2014 | A | The ratio of macronutrients, not caloric intake, dictates cardiometabolic health, aging, and longevity in ad libitum-fed mice SOL2014 Lifespan and cardiometabolic health were determined not by caloric intake but by the protein:carbohydrate ratio; a low protein ratio was associated with lower hepatic mTOR activation. |
| 2026 | R | The hallmarks of protein and amino acid restriction in aging and longevity KNO2026 Defines the "hallmarks" of dietary protein restriction (PR) through the lens of aging: PR and restriction of specific essential amino acids — especially methionine, isoleucine and valine — improve metabolic health, healthspan and lifespan across organisms, with amino-acid composition (not just protein quantity) acting as a key determinant via nutrient-sensing pathways including mTORC1. |
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