Ultrarunners increasingly treat calories as survival infrastructure.

Many mountaineers still treat food as optional.

On big mountains, climbers routinely operate while hypoxic, dehydrated, sleep-deprived, cold, and underfueled. The brain compensates — until it no longer can. Poor judgment, fixation, irritability, confusion, clumsiness, and irrational decisions may not be personality or “mental weakness.” They may be neuroglycopenia at altitude.

The dangerous part is that hypoglycemia rarely feels dramatic at first.

It feels like continuing.

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