Popular Supplement Ingredient Linked to Shorter Lifespans in Men
Summary
A new study found that higher natural levels of the amino acid tyrosine in men's blood may be linked to shorter lifespans. The research showed this connection was stronger in men than in women, but it did not directly test tyrosine supplements.Key Facts
- Tyrosine is an amino acid that helps the body make important brain chemicals affecting mood and stress.
- The study used data from over 270,000 people in the U.K. Biobank to study amino acids and lifespan.
- Men with higher blood tyrosine levels were likely to live nearly one year less than those with lower levels.
- No clear link between tyrosine levels and lifespan was found in women.
- The research suggests insulin resistance and stress response changes could explain the effect in men.
- Phenylalanine, another related amino acid, was not linked to lifespan after considering tyrosine levels.
- The study did not test if tyrosine supplements cause harm, only looked at naturally occurring blood levels.
- Lowering protein intake might reduce tyrosine levels, but it is unclear if this helps people live longer.
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