Nikhil Prasad Fact checked by:Thailand Medical News Team May 15, 2026 1 hour, 11 minutes ago
Medical News: A major new scientific study is raising fresh concerns about tyrosine, a popular amino acid commonly promoted in supplements for focus, alertness, mood, and mental performance. Researchers have discovered that men with genetically higher levels of tyrosine in their bloodstream appeared to live shorter lives, sparking debate about whether long-term exposure to high tyrosine levels from supplements and tyrosine-rich diets could negatively affect longevity.
Scientists warn that chronically high tyrosine levels from supplements and protein-rich diets may quietly reduce lifespan in men
The study was carried out by scientists from the University of Hong Kong and the University of Georgia in Athens, United States. The research analyzed genetic and health data from more than 270,000 individuals enrolled in the UK Biobank.
Tyrosine and its precursor phenylalanine are amino acids naturally found in protein-rich foods including meat, eggs, dairy products, soy, beans, poultry, and fish. Both are also widely used in nutritional supplements, workout products, nootropic formulations, and energy drinks designed to improve concentration and stress resistance.
Why Scientists Are Paying Attention to Tyrosine
Tyrosine is essential for producing important neurotransmitters such as dopamine, norepinephrine, and epinephrine. These brain chemicals regulate motivation, mental sharpness, mood, attention, and the body’s stress response.
Because of these effects, tyrosine supplements have become increasingly popular among students, athletes, office workers, and people seeking improved mental performance during stressful situations.
However, scientists have long suspected that biological systems that improve short-term performance may sometimes come with long-term tradeoffs.
For years, animal studies have shown that reducing overall protein intake can extend lifespan in several species including worms, flies, and rodents. More recent experiments suggest that certain amino acids themselves may directly influence aging pathways.
Previous laboratory research found that restricting tyrosine intake reduced activity in important nutrient-sensing pathways linked to aging, including the mTORC1 and insulin signaling systems. Lowering tyrosine levels in animal experiments also appeared to prolong lifespan.
This
Medical News report notes that the new human study now provides some of the strongest evidence yet that tyrosine itself may play a significant role in human longevity, especially in men.
What The Study Found
Researchers used both observational analysis and a sophisticated genetic method called Mendelian randomization. This technique uses inherited genetic differences to help determine whether a biological factor may directly contribute to disease or lifespan changes.
At first, both phenylalanine and tyrosine appeared linked to higher mortality risk. But after adjusting for the overlapping rela
tionship between the two amino acids, only tyrosine remained consistently associated with shorter lifespan.
The effect was especially strong in men. Researchers estimated that men with genetically higher tyrosine levels lived approximately 0.9 years less on average. In women, the association was much weaker and not considered statistically significant.
Scientists also pointed out that men naturally tend to have higher circulating tyrosine levels than women. This difference could partly help explain why men generally have shorter life expectancy worldwide.
Globally, women outlive men by several years, and in some countries the gap widened significantly during and after the COVID-19 pandemic.
How Tyrosine Could Affect Aging
Researchers believe several biological mechanisms may explain the findings. One major possibility involves insulin resistance, a metabolic condition strongly linked to diabetes, heart disease, obesity, and accelerated aging. Earlier studies have already connected elevated tyrosine levels with poorer insulin sensitivity. Since insulin signaling plays a central role in metabolism, growth, and aging, disruptions in these pathways over decades may contribute to shorter lifespan.
Tyrosine also fuels the production of stress-related neurotransmitters and hormones. Although these chemicals improve alertness and performance during stressful situations, long-term overstimulation of stress pathways may gradually damage the body.
Researchers believe sex hormones such as testosterone and estrogen may interact differently with tyrosine-related pathways, which could explain why the harmful lifespan effect appeared more pronounced in men.
The study also found some evidence that phenylalanine may still influence cardiovascular disease and cancer risk, although it did not independently affect lifespan once tyrosine was considered.
Researchers Urge Caution
The scientists emphasized that the study does not directly prove tyrosine supplements shorten lifespan. Blood tyrosine levels are influenced by genetics, dietary habits, metabolism, and overall health.
The findings also do not mean people should avoid healthy protein-rich foods, since tyrosine is necessary for normal brain and body function.
Still, the researchers warned that chronically elevated tyrosine levels may potentially influence aging, particularly in individuals already predisposed to high levels. They say future studies should investigate whether dietary approaches such as moderate protein restriction or lifestyle interventions could safely lower tyrosine levels and improve healthy aging outcomes.
Conclusion
The findings provide an important warning about the possible long-term effects of chronically elevated tyrosine levels. While tyrosine supplements and high-protein diets are often promoted for improving energy, focus, and mental performance, the new evidence suggests there may be hidden biological costs over time, particularly for men. Scientists stress that more human research is needed before firm dietary recommendations can be made, but the study raises serious questions about the growing trend of long-term amino acid supplementation and excessive intake of performance-enhancing nutritional products.
The study findings were published in the peer reviewed journal: Aging
https://www.aging-us.com/article/206326/text
For the latest research on longevity and extending lifespans, keep on logging to Thailand
Medical News.
Read Also:
https://www.thailandmedical.news/articles/anti-aging
https://www.thailandmedical.news/articles/supplements
https://thailandwellness.news/
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