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Marathon Running: Brain Uses Myelin as Fuel, Study Finds

4/5/2025

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Summary

Story summary

A groundbreaking study in Nature Metabolism uncovers that marathon running can cause the brain to temporarily use myelin, its vital protective layer, as fuel. Scans of ten runners revealed diminished myelin levels after the race, especially in regions tied to movement and emotions. Though these changes are reversible, those with neurological conditions like ALS should exercise caution.

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Story summary

A groundbreaking study in Nature Metabolism uncovers that marathon running can cause the brain to temporarily use myelin, its vital protective layer, as fuel. Scans of ten runners revealed diminished myelin levels after the race, especially in regions tied to movement and emotions. Though these changes are reversible, those with neurological conditions like ALS should exercise caution.