Bound polyphenols extracted from carrot dietary fiber (CDF-BP) extended mean lifespan in Caenorhabditis elegans by 25.58% at a concentration of 50 μg/mL. Beyond longevity, CDF-BP improved healthspan markers — enhancing motility while reducing lipofuscin accumulation and lipid deposition. Multi-omics analysis pinpointed the mechanism: CDF-BP activated insulin/IGF-1 signaling targets DAF-16 and SKN-1, upregulated stress-response genes sod-3 and gst-4, and shifted lipid metabolism from storage toward oxidative utilization via carnitine shuttle activation. Genetic mutant confirmation locked in pathway dependency.
The finding reframes a persistently overlooked fraction of dietary polyphenols. Most polyphenol research — and virtually all commercial interest — targets free polyphenols, which are immediately bioavailable. Bound polyphenols, tethered to fiber matrices, survive to the colon where microbial fermentation liberates them, potentially generating sustained systemic exposure. This colonic release dynamic is largely absent from the C. elegans model, which lacks a gut microbiome, meaning the true human potency of CDF-BP may actually be understated here.
The DAF-16/SKN-1 axis is well-established — it mirrors FOXO3 and NRF2 in mammals, two of the most validated longevity-associated transcription factors in human epidemiology. The 25% lifespan extension is notable even by C. elegans standards, though worm-to-human translation remains an enormous leap. This is incremental but directionally significant work: it argues that whole-food dietary fiber matrices, not just isolated polyphenol extracts, deserve attention as precision nutrition tools for aging.
