The
Journal.

Sweat science, sodium numbers and training notes. Written for athletes who actually sweat. No fluff.

How Much Sodium Do You Actually Lose in Sweat?
electrolytes25 Oct 2026 4 min read

How Much Sodium Do You Actually Lose in Sweat?

Most people lose 900–1,000mg of sodium per litre of sweat, and some lose over 2,000mg. Here's how to estimate your losses and why most sports drinks fall short.

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