Study Shows Ketone Bodies Can Independently Sustain Brain Energy Without Glucose
Researchers using an ex vivo brain preparation found that β-hydroxybutyrate (a ketone body) can independently maintain brain tissue metabolism and function when glucose is absent. The study monitored mitochondrial function and tested tissue resilience by inducing spreading depolarization, a severe metabolic stress. The findings support the potential use of ketogenic approaches in treating neurological disorders involving energy metabolism or glucose availability issues.
A new preprint study published on bioRxiv examined whether ketone bodies can sustain brain metabolism independently of glucose by using an isolated brain tissue preparation supplied only with β-hydroxybutyrate (BHB) as fuel. Researchers monitored mitochondrial function after prolonged exposure to glucose-free conditions and tested tissue resilience by inducing spreading depolarization, a severe energetic challenge requiring rapid restoration of cellular balance. The results showed that mitochondria dynamically regulated oxygen utilization while maintaining sufficient energy reserves to allow brain tissue to generate and recover from repeated spreading depolarizations. These findings demonstrate that ketone bodies alone can support essential metabolic and functional properties of brain tissue, broadening understanding of how the brain can flexibly use different fuel sources. The authors suggest these results provide additional support for ketogenic dietary strategies in neurological conditions where energy metabolism or glucose availability may be compromised.
What's missing
The study uses an ex vivo (isolated tissue) preparation rather than in vivo (whole organism) conditions, which may not fully replicate the complexity of brain metabolism in living animals or humans. The authors acknowledge that resolving this question in vivo is difficult because the body maintains circulating glucose even during starvation through endogenous production, but the extent to which these ex vivo findings translate to intact organisms remains to be determined.
What different sources said
- bioRxivCenter
β-Hydroxybutyrate maintains energetically demanding neural functions during glucose deprivation
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