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A Flawed Conjecture Keeps Haunting Brain Energy Metabolism Research
1Department of Anesthesiology and Perioperative Medicine, School of Medicine, University of Louisville, Louisville, KY 40202, USA.
Neurosci
|April 24, 2026
Summary
Brain energy metabolism research is divided over whether lactate or glucose fuels the active brain. This perspective suggests a paradigm shift: lactate, not pyruvate, is the end-product of glycolysis, potentially resolving this debate.
Area of Science:
- Neuroscience
- Cellular Metabolism
- Biochemistry
Background:
- Two 1988 studies initiated a debate on brain energy metabolism, dividing researchers into factions supporting either lactate or glucose as the primary fuel for neuronal activity.
- One faction supports lactate as the sole oxidative mitochondrial substrate for neuronal function, while the other posits "aerobic glycolysis" where glucose consumption is uncoupled from oxygen consumption.
- This division has persisted for decades, with hypotheses like the "Astrocyte Neuron Lactate Shuttle" and "Efficiency Tradeoff" failing to reconcile the opposing views.
Purpose of the Study:
- To highlight the principal disagreements in brain energy metabolism research.
- To propose a resolution to the long-standing debate between lactate and glucose metabolism in the active brain.
- To introduce a paradigm shift in understanding glycolysis end-products to bridge the gap between research factions.
Main Methods:
- This is a perspective piece, not an experimental study.
- It analyzes existing hypotheses and research findings in brain energy metabolism.
- It critically evaluates the assumption regarding the end-product of aerobic glycolysis.
Main Results:
- The primary disagreement stems from the assumption that pyruvate is the end-product of aerobic glycolysis.
- Many researchers acknowledge lactate as the end-product under aerobic conditions, even while adhering to the pyruvate assumption.
- The debate persists despite efforts to bridge the gap, as evidenced by recent editorial responses.
Conclusions:
- A paradigm shift, viewing lactate as the universal end-product of glycolysis regardless of oxygen presence, could resolve the debate.
- This unified view of glycolysis would reconcile factions supporting oxidative lactate metabolism and non-oxidative glucose metabolism.
- Revisiting the end-product of glycolysis offers a potential solution to the enduring controversy in brain energy metabolism.
Keywords:
TCA cycleactive brainenergy metabolismglucoseglycolysislactateoxidative phosphorylationpyruvateMore Related Videos
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