Neurochemical and genetic effects of the ketogenic diet: alterations in brain GABA, glutamate, and related gene.
Level 5 - mechanism / opinion, no new human data
Preclinical animal research
PubMed 41026273 · doi:10.1007/s11033-025-11077-y
What was done
Eighteen male rats were divided into two weight-matched groups: a normal diet group receiving standard rat chow (10% protein, 80% carbohydrates, 10% fat) and a ketogenic diet group receiving a high-fat diet mimicking a 4:1 ratio (8% protein, 2% carbohydrates, 90% fat). Both diets were administered for 30 days. Investigators measured serum beta-hydroxybutyric acid, brain glutamate, brain GABA, and associated markers including GAD65, GAD67, and GABA transaminase.
What was found
No absolute baseline or endpoint values were provided in the abstract. Compared with the normal diet group, the ketogenic diet group showed significantly higher serum beta-hydroxybutyric acid (p < 0.001), lower brain glutamate (p = 0.001), and higher brain GABA (p = 0.041). The ketogenic diet group also demonstrated increased GAD67 (p = 0.036) and decreased GABA-T (p = 0.035). Results for GAD65 were not reported in the abstract.
Why it matters
This study provides experimental evidence in a rodent model that a ketogenic diet alters the balance between excitatory and inhibitory neurotransmitters, supporting a possible neurochemical mechanism for its antiseizure effects.
Limits
The study was conducted in a small sample of male rats (n = 18 total) rather than humans or an established animal model of epilepsy. No functional seizure outcomes or behavioral assays were measured. Absolute concentrations, effect sizes, and findings for GAD65 were not reported in the abstract.
Cited by
- supports Ketone bodies increase the level of the inhibitory neurotransmitter GABA in the brain.
- supports Beta-hydroxybutyrate increases GABA and balances glutamate and GABA neurotransmission in the brain.