Ketogenic Diet Reduces Midlife Mortality and Improves Memory in Aging Mice.
Level 5 - mechanism / opinion, no new human data
Animal research (rodent model) without human clinical data.
PubMed 28877458 · doi:10.1016/j.cmet.2017.08.004
What was done
Researchers investigated the effects of an isoprotein ketogenic diet on longevity and healthspan in male C57BL/6 mice. To avoid obesity, the ketogenic diet was administered cyclically (alternated weekly with a control diet). Comparisons were made against a control diet and a cyclically fed non-ketogenic high-fat diet. Outcomes assessed included midlife mortality, maximum lifespan, old-age memory performance, composite healthspan markers, and tissue gene expression.
What was found
The abstract reports directional findings without numerical values or effect sizes. Cyclic ketogenic diet reduced midlife mortality and improved memory performance in old age, with modest improvements in composite healthspan measures, but had no effect on maximum lifespan. The high-fat diet showed an intermediate mortality effect. Both high-fat and ketogenic diets downregulated insulin, protein synthesis, and fatty acid synthesis pathways, whereas upregulation of PPARα target genes was unique to the ketogenic diet across tissues.
Why it matters
This work demonstrates that cyclical ketogenic feeding can reduce midlife mortality and preserve memory in aging rodents through metabolic pathways distinct from a general high-fat diet.
Limits
The study was conducted solely in male C57BL/6 mice, limiting direct translation to females or humans. The abstract does not report sample sizes, specific numeric measurements, or variance metrics.
Cited by
- supports Preclinical studies by Dr. Eric Verdin and Dr. John Ramsey showed that feeding mice a cyclical ketogenic diet in midlife improved median lifespan and healthspan without affecting maximum lifespan.
- partial In Dr. Eric Verdin's mouse study, older mice fed a cyclical ketogenic diet exhibited better cognitive function than younger mice.
- supports Rodent studies by Verdin and Ramsey demonstrated suppression of spontaneous tumor formation on a ketogenic diet.
- supports Published rodent studies by Eric Verdin and John Ramsey showed a reduction in the incidence of spontaneous tumors on a ketogenic diet.