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Lactate Is Not the Enemy (Or A Miracle Fuel)

Marathon Handbook · 10/1/2026, 13:58:24

For decades, lactate was blamed for burning legs and muscle fatigue. Now the pendulum has swung the other way, as things tend to do in this space. Lactate is a fuel, a signaling molecule, and it might even be something athletes should consume during exercise. The article argues both extreme readings fail to hold up: lactate is neither the culprit behind fatigue nor a miracle fuel for performance.

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