Electrolytes Explained: What They Actually Do
What an electrolyte is
Electrolytes are minerals that carry an electric charge in fluid: mainly sodium, potassium, chloride, magnesium, calcium and bicarbonate. They govern how much water stays in your blood and cells, how nerves fire, and how muscles contract. 'Hydration' is not just water in — it is water in the right compartments, and electrolytes are how your body decides.
Why plain water is sometimes not enough
When you sweat, vomit, or simply eat and drink far less than usual, you lose minerals with the water. Drink only water after heavy losses and you can dilute what sodium remains. That is the entire reason this category exists: replace the salts with the fluid, in roughly the proportions you lost them.
The honest middle
For a normal day at a desk, food and water cover most people most of the time. Electrolyte drinks earn their keep when losses are real — heat, long exercise, illness, very low food intake — or when a clinician has advised a specific intake. Dose to the job: that is the whole philosophy of this site, and it is why our comparison starts with milligrams, not flavours.