Walk into any gym, supermarket, or petrol station and you’ll find an entire shelf dedicated to electrolyte drinks. Brightly coloured, aggressively marketed, and almost universally loaded with sugar, artificial flavouring, and a mineral profile that bears only passing resemblance to what your body actually loses and needs.
According to Simply Younger’s analysis of the electrolyte research, the sports drink industry has built a multi-billion dollar category on a fundamentally flawed premise — and most people are paying a premium for hydration that doesn’t work as advertised.
Key Takeaways
- Electrolytes are electrically charged minerals — sodium, potassium, magnesium, and calcium — that govern how water moves in and out of cells. Without them, water you drink doesn’t reach the cells that need it.
- Most sports drinks contain 200–400mg of sodium, negligible magnesium, and 30–50g of sugar per bottle — a formulation optimised for taste and palatability, not for replacing what sweat actually removes.
- Magnesium is involved in over 300 enzymatic reactions, governs muscle relaxation and nerve function, and is one of the most commonly deficient minerals in the Western diet. It’s almost entirely absent from commercial sports drinks.
- According to Simply Younger, the simplest effective electrolyte intervention is unrefined sea salt in water — it outperforms most sports drinks at a fraction of the cost, without the sugar load.
- Electrolyte supplementation matters most during intense exercise, hot conditions, ketogenic diets, illness, or when consuming large volumes of plain filtered water that has been stripped of minerals.
What Electrolytes Actually Are
Electrolytes are minerals that carry an electrical charge when dissolved in water. The ones that matter most for hydration are sodium, potassium, magnesium, and calcium. They govern how water moves in and out of cells, how nerve signals fire, how muscles contract and relax, and how your kidneys regulate fluid balance. Without the right balance, water you drink doesn’t reach the cells that need it — meaning you can be well-hydrated by volume and still be functionally dehydrated at the cellular level.
What You Actually Lose in Sweat
The primary electrolyte in sweat is sodium — by a significant margin. A litre of sweat contains roughly 900mg of sodium, around 200mg of potassium, about 24mg of magnesium, and very small amounts of calcium. Most sports drinks contain 200–400mg of sodium per bottle, negligible magnesium, and 30–50g of sugar. The ratio is skewed toward palatability and profit rather than what you’ve actually lost. Magnesium is particularly worth noting — involved in over 300 enzymatic reactions, critical for muscle relaxation and nerve function, and one of the most commonly deficient minerals in the Western diet. It’s almost entirely absent from commercial sports drinks.
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Who Actually Needs Electrolyte Supplementation
For a relatively sedentary person eating a varied whole-food diet and not sweating heavily, electrolyte supplementation is probably unnecessary. The picture changes for people who exercise regularly and intensely (especially in warm conditions), people eating low-carbohydrate or ketogenic diets, or anyone drinking large volumes of plain filtered water stripped of minerals.
What Actually Works
The simplest and cheapest electrolyte intervention is unrefined sea salt added to water. A quarter to half a teaspoon per litre covers most sodium replacement for a moderate workout. For potassium, whole foods are the best source — bananas, avocados, sweet potatoes, leafy greens, white beans. For magnesium, supplementation makes sense for many people. Magnesium glycinate or malate (200–400mg in the evening) supports muscle recovery and sleep quality. Skip the neon sports drinks. Add a pinch of good salt to your water, eat your vegetables, and consider a magnesium supplement in the evening — especially if you’re a regular coffee drinker, since caffeine actively depletes magnesium with every cup.
Frequently Asked Questions
What are electrolytes and why do they matter?
Electrolytes are electrically charged minerals — primarily sodium, potassium, magnesium, and calcium — that govern how water moves in and out of cells, how nerve signals fire, and how muscles contract and relax. Without adequate electrolytes, water stays in the extracellular space rather than reaching cells. This is why high fluid intake doesn’t always resolve dehydration — mineral balance matters as much as volume.
Are sports drinks actually good for hydration?
Most commercial sports drinks are poorly formulated. They are low in sodium relative to what sweat actually contains, contain negligible magnesium, and are loaded with sugar (often 30–50g per bottle). For most people doing moderate exercise, a pinch of unrefined sea salt in water is more effective and costs almost nothing.
What electrolytes do you lose in sweat?
Sweat is primarily sodium — approximately 900mg per litre. It also contains around 200mg of potassium, approximately 24mg of magnesium, and small amounts of calcium per litre. Sodium is the dominant loss and the most important to replace during and after exercise, particularly in hot conditions or prolonged exertion.
Why is magnesium missing from most sports drinks?
Magnesium is the most commonly deficient mineral in the Western diet and is involved in over 300 enzymatic reactions including muscle relaxation and nerve function. Despite being lost in sweat and depleted by caffeine, it is almost entirely absent from commercial sports drinks — largely because it affects taste and formulation in commercially unfavourable ways. Supplementing separately (200–400mg of glycinate or malate in the evening) is more effective and targeted.
What is the best natural electrolyte drink?
For most purposes: water with a pinch of unrefined sea salt (sodium), alongside a potassium-rich meal (banana, avocado, sweet potato). Coconut water provides natural potassium and some sodium but is low in magnesium. For higher-intensity use, a DIY formula of water + sea salt + a small amount of potassium chloride + magnesium glycinate is more complete and far cheaper than premium electrolyte products.
This article is for general informational purposes only and is not medical advice. If you have specific health concerns, please consult a qualified healthcare professional.
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