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Ketones suppress brain glucose consumption.

Joseph C LaManna¹, Nicolas Salem, Michelle Puchowicz

¹Department of Anatomy, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Advances in Experimental Medicine and Biology

|February 21, 2009

Summary

The brain uses glucose for energy but can switch to ketone bodies during ketosis. This study found that increased ketone levels significantly decrease glucose consumption in rat brain regions.

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Published on: January 4, 2018

Area of Science:

Neuroscience
Metabolic Research
Biochemistry

Background:

The brain primarily relies on glucose for energy.
Ketone bodies (beta-hydroxybutyrate and acetoacetate) can serve as alternative energy sources during fasting or ketogenic diets.
Understanding brain energy metabolism shifts during ketosis is crucial.

Purpose of the Study:

To quantify the impact of elevated ketone levels on cerebral glucose metabolism in rats.
To investigate regional differences in glucose consumption under ketogenic conditions.

Main Methods:

Utilized Positron Emission Tomography (PET) with 2-Deoxy-2[18F]Fluoro-D-Glucose (FDG) to measure cerebral metabolic rate of glucose consumption (CMRglu).
Employed Patlak analysis for quantitative CMRglu calculations in control and ketotic rats.
Integrated PET imaging with Magnetic Resonance Imaging (MRI) for precise anatomical localization.

Main Results:

A significant inverse correlation was observed between plasma beta-hydroxybutyrate (BHB) concentration and CMRglu in both the cerebellum and frontal cortex.
Cerebral glucose consumption decreased by approximately 10% for every 1 mM increase in plasma BHB.
The relationship was quantified by regression equations for cerebellum and frontal cortex.

Conclusions:

Ketosis leads to a substantial reduction in cerebral glucose utilization in key brain regions.
This highlights the brain's metabolic flexibility and adaptation to alternative fuel sources.
Findings provide quantitative insights into the neuro-metabolic consequences of ketogenic states.