A large new study suggests that higher levels of a common amino acid called tyrosine may be linked to a shorter lifespan in men.
MONDAY, Mar. 2, 2026 — A large new study suggests that higher levels of a common amino acid called tyrosine may be linked to a shorter lifespan in men. , examined whether blood levels of two amino acids, phenylalanine and tyrosine, were connected to how long people live.
Amino acids are building blocks of protein. They are found in protein-rich foods such as milk, eggs and meat, and are also sold as Researchers from the University of Hong Kong and the University of Georgia analyzed health and genetic data from more than 270,000 people in the U.K. Biobank, a large long-term health study in the U.K. At first, both amino acids appeared to be tied to a higher risk of death. But after closer analysis, only tyrosine showed a strong and consistent link, specifically in men. Genetic modeling suggested that men with higher tyrosine levels could live nearly one year less on average. The researchers did not find the same link in women. "Phenylalanine showed no association with lifespan in either men or women after controlling for tyrosine," the authors explained.Researchers also noted that men tend to have higher tyrosine levels than women. This difference could help explain why men often have shorter lifespans in general.directly. But the findings raise questions about whether very high levels of the amino acid over time could affect lifespan.Kaixiong Ye, an associate professor of genetics at the University of Georgia, is a co-author of the study.Low Testosterone Quiz: Test Your IQ of Men's Conditions What causes low testosterone? Take the Low-T quiz to learn about symptoms, signs, low testosterone in men, effects of low testosterone, and what constitutes low testosterone levels.
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