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

Restricting larval protein intake reduces Lsp2 levels, decreases ribosomal proteins, and extends adult lifespan in Drosophila by up to a significant margin.

• Why it matters: Understanding how early-life nutrition influences adult health can reveal mechanisms to promote longevity and prevent age-related decline, addressing a long-standing biological question.
• What they did: The study used stable-isotope tracing and genetic silencing of Lsp2 in Drosophila to show that larval amino acids are retained into adulthood, affecting ribosomal protein synthesis and lifespan.
• The result: Downregulating Lsp2 mimics early-life protein restriction, decreasing translation activity and extending lifespan, highlighting Lsp2 as a key molecular link between juvenile diet and adult health.