This study examined how the brain's fuel source influences communication between different brain regions. Using MRI scans, the researchers found that brain network stability—a marker associated with healthy brain function—begins to decline around age 47 and deteriorates more rapidly after age 60. Younger adults with type 2 diabetes showed patterns of brain aging similar to healthy people about five years older, suggesting metabolic dysfunction may accelerate age-related changes.

The researchers then tested whether raising blood ketone levels could improve brain function. Whether participants reached ketosis through an overnight fast, a ketogenic diet, or an exogenous ketone drink, brain network stability consistently improved compared to a standard diet or a glucose drink. While the study measured brain connectivity rather than memory or cognition directly, the findings support the idea that the brain functions more efficiently when ketones are available as fuel and further strengthen the link between metabolic health and long-term brain health.

https://www.researchgate.net/publication/339672033_Diet_modulates_brain_network_stability_a_biomarker_for_brain_aging_in_young_adults