# Fish-Eaters and Vegetarians Show Slower Biological Aging Than Regular Meat-Eaters

- **Evidence Level**: Moderate
- **Journal**: Clinical nutrition (Edinburgh, Scotland)
- **Sample Size**: 407,376 adults at baseline, 8,855 at follow-up
- **Published**: 2026-02-24
- **Topics**: diet, biological aging, longevity
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/41826182/

## Summary

Among over 400,000 UK adults, people who ate fish but little meat aged the slowest biologically. Vegetarians came in a close second. Regular meat-eaters aged fastest by two different biological age measures. These patterns held up over time too. People who stuck with low-meat, fish-based, or vegetarian diets saw their biological aging slow down compared to consistent meat-eaters during follow-up.

## Practical Takeaway

This study suggests reducing meat and including fish may be linked to slower biological aging.

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