A large new study suggests that higher levels of a common amino acid called tyrosine may be linked to a shorter lifespan in men.
The research, published recently in the journal Aging-US, 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 dietary supplements.
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.
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