# Eating Less Protein Early in Life Extends Lifespan in Fruit Flies

_Evidence Level: Preliminary · Kosakamoto H et al., Nature, DOI 10.1038/s41586-026-11031-3_

*Lsp2 links early-life diet to adult translation and lifespan in Drosophila.*

- **Evidence Level**: Preliminary
- **Why this grade**: Lab experiments in fruit flies using genetic tools and isotope tracing, yet no data from mammals or people.
- **Population**: Animal study
- **Publication Types**: Journal Article
- **Journal**: Nature
- **Sample Size**: Fruit flies (number not stated)
- **Authors**: Kosakamoto H, Okada R, Barker CS, Isomura-Matoba A, Seita J, Dohmae N, Imami K, Obata F
- **Graded and published**: 2026-09-23
- **Last edited**: 2026-09-25
- **Topics**: protein restriction, lifespan, nutrition
- **DOI**: https://doi.org/10.1038/s41586-026-11031-3
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42778590/

## Summary

Cutting back on protein while young helped fruit flies live longer as adults, and scientists now know why. Larvae fed less protein stored smaller protein reserves, so their adult cells built fewer ribosomes (the tiny factories that make proteins). This adds weight to the idea that what we eat early may leave a lasting mark on how we age. It has only been shown in flies, so nobody knows whether the same memory exists in people.

## Practical Takeaway

This study suggests early-life protein intake may shape lifespan, though only in flies so far.

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_Canonical: https://longevity-germany.com/en/research/eating-less-protein-early-in-life-extends-lifespan-in-fruit-flies · Part of Longevity Cities · Updated 2026-09-25_