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We often think sweat is just salty water. Wrong.
It’s a rich biochemical cocktail… except you lose it without ever drinking it.
And if you don’t smartly replace what you’re losing, you’re heading straight for fatigue, cramps, and poor performance.
🧪 What’s actually in your sweat (spoiler: it’s not just water)
In 1 litre of sweat, you lose on average:
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900 mg of sodium
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200-300 mg of potassium
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30-50 mg of magnesium
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And a bit of zinc, calcium, and other micronutrients
“The composition of human sweat shows a significant loss of sodium and potassium that can lead to muscular failure without adequate replacement.” Maughan RJ et al., Journal of Sports Sciences, 2004
Water doesn’t replace minerals. It dilutes them.
You’re thirsty → you drink water → you feel even more sluggish.
Normal. You’ve just diluted whatever electrolytes you had left in your body.
It’s like filling up an aquarium… without putting the fish back in.
“Rehydrating with water alone can worsen electrolyte imbalances after significant sweat loss.” Shirreffs SM et al., British Journal of Nutrition, 2007
What about sugary drinks, then?
They often have:
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Too little sodium
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Too much glucose
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A glycaemic index that causes a spike → crash → fatigue
Basically, you go from “I’m drained” to “I’m drained and I’ve got a sugar crash”. So, as you’ve probably gathered, there’s no point focusing your attention on products that contain sugar.
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