Research

Hormonal

Reducing the intake of specific amino acids, particularly leucine and histidine, which are abundant in animal proteins, is associated with decreased fat mass and improved insulin resistance independent of total caloric intake.

Focus on the source of your protein. Plant proteins are naturally lower in leucine and histidine compared to animal proteins. This specific amino acid profile may help improve insulin sensitivity and reduce fat mass, even if total protein intake is adequate.

GoodSupportsHIGH confidence
In particular, decreased % leucine intake was associated with a decrease in fat mass (r = +0.40; p < 0.001)... In addition, decreased % histidine intake was associated with a decrease in insulin resistance (r = +0.38; p = 0.003), also independent of changes in BMI and energy intake.
Hana Kahleová et al. · Nutrition and Diabetes · 2018

Why this rating

Secondary analysis of RCT data showing strong correlations, though causality is suggested rather than definitively proven for the amino acids alone.

Source

A plant-based diet in overweight individuals in a 16-week randomized clinical trial: metabolic benefits of plant protein

Hana Kahleová et al. · Nutrition and Diabetes · 2018

DOI 10.1038/s41387-018-0067-4

rct · n=75Cited 148×
Read the paper
DOI resolved against Crossref · corpus check 2026-06-10

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