Low Methionine and Cysteine Diet Sparks Fat Burning in Mice

Reducing two amino acids common in animal protein—methionine and cysteine—in mice boosted energy expenditure by about 20% via beige fat, causing weight loss without changing food intake or activity, and was comparable to constant cold exposure, suggesting diet alone could activate fat-burning pathways, though human relevance remains unproven and further work on safety and applicability is needed.