Current medical scienceNov 7, 2025

Understanding Tryptophan's Role in Obesity

Updated Nov 11, 2025

Abstract

Obesity is a widespread health issue linked to ongoing inflammation and various metabolic problems like insulin resistance and diabetes. Researchers are increasingly looking at how amino acids, especially tryptophan, affect metabolism. Tryptophan is an essential amino acid involved in several important biological processes. Recent studies show that people with obesity have different levels of tryptophan metabolites and enzymes, which can impact their mood and overall health. This review explores how tryptophan metabolism works and discusses its potential as a new treatment approach for obesity and related health issues.

Simplified

Obesity is a common noncommunicable disease characterized by persistent low-grade chronic inflammation and is associated with various metabolic disturbances, including insulin resistance and diabetes. The search for effective obesity treatments has led to growing interest in the role of amino acids in metabolic regulation. Tryptophan (TRP), an essential amino acid, participates in several biological pathways, including the kynurenine, 5-hydroxytryptamine (5-HT, also known as serotonin), and indole pathways. Recent evidence underscores the significance of TRP metabolism in obesity, showing that various metabolites and enzymes in its metabolic pathways are altered in individuals with obesity. These changes influence physiological processes, mood regulation, and overall metabolic health. This review provides a comprehensive overview of TRP metabolism. It highlights the potential of targeting TRP metabolism as a therapeutic strategy for managing obesity and its related metabolic and psychological comorbidities.

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