By Tarun Sai Lomte Reviewed by Susha Cheriyedath, M.Sc. Mar 1 2026 A large genetic analysis suggests that one amino acid linked to protein metabolism could influence how long we live, with potential sex-specific effects that challenge assumptions about diet and longevity. Study: The role of phenylalanine and tyrosine in longevity: a cohort and Mendelian randomization study . Image Credit: Oleg Troino / Shutterstock In a recent study published in the journal  Aging , researchers investigated the