Ketogenic diet improves motor performance but not cognition in two mouse models of Alzheimer's pathology.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model study
PubMed 24069439 · doi:10.1371/journal.pone.0075713
What was done
Five-month-old APP/PS1 (amyloid model), Tg4510 (tau model), and nontransgenic control mice were fed either a ketogenic diet or a control diet (NIH-31) for 3 months. Investigators monitored body weight, food consumption, and blood ketone and glucose levels (at 4 weeks and 4 months). During the final two weeks, mice underwent behavioral testing via rotarod, open field, and radial arm water maze, followed by tissue analysis of amyloid, tau, and astroglial/microglial markers.
What was found
Mice fed the ketogenic diet performed significantly better on the rotarod than those on the control diet, independent of genotype. However, the ketogenic diet did not alter the elevated locomotor activity in transgenic lines during the open field test, did not rescue spatial learning deficits in the radial arm water maze, and did not produce significant differences in tissue levels of amyloid, tau, or glial markers. Exact numerical values and statistical test metrics were not reported in the abstract.
Why it matters
While ketogenic diets have been hypothesized to mitigate energy deficits in Alzheimer's disease, these findings indicate that ketosis can improve basic motor coordination in mice without modifying underlying amyloid/tau pathology or cognitive decline.
Limits
The study was conducted exclusively in mouse models of amyloid and tau pathology, which do not fully replicate human Alzheimer's disease. The abstract does not report specific sample sizes (n per group), exact numerical data, or effect sizes for the behavioral and histological assays.
Cited by
- context In a study conducted at the USF Byrd Alzheimer's Institute, mice on an MCT-supplemented ketogenic diet ran approximately 30% longer and faster on a treadmill despite no robust changes in amyloid beta or tau pathology.