You can restore electrolytes through food, drinks, or a simple homemade solution made with water, salt, and sugar. The right approach depends on why you lost them in the first place. A tough workout, a bout of vomiting or diarrhea, a hot day, or simply not eating enough of the right foods can all drain your body’s electrolyte stores. Here’s how to bring them back effectively and safely.
Why Electrolytes Matter
Electrolytes are minerals that carry an electrical charge in your body’s fluids. Sodium and potassium work as a pair, constantly being exchanged across cell membranes to regulate fluid balance and keep your nerves firing properly. Calcium drives muscle contraction, nerve signaling, and blood clotting. Magnesium powers your body’s energy production and helps muscles relax after they contract. When any of these drop too low, the systems they support start misfiring.
Low sodium causes headaches, confusion, nausea, and in severe cases, seizures. Low potassium leads to muscle cramps, weakness, and heart rhythm irregularities. Low magnesium overlaps with both, producing fatigue, muscle twitches, and difficulty concentrating. If you’re feeling “off” after sweating heavily, being sick, or skipping meals, depleted electrolytes are a likely culprit.
How You Lose Electrolytes
Sweat is the most common route. Whole-body sweat sodium concentration ranges from about 10 to 70 millimoles per liter, with potassium losses typically between 2 and 8 millimoles per liter. That’s a wide range because sweat composition varies enormously between individuals, and it changes depending on fitness level, heat acclimatization, and exercise intensity. Someone doing a long run in humid weather loses far more than someone walking in mild conditions.
Vomiting and diarrhea strip electrolytes even faster because you’re losing concentrated digestive fluids. Alcohol and certain medications (especially diuretics) also accelerate losses. Even chronic low-grade dehydration from not drinking enough water throughout the day can gradually throw your levels off.
The Fastest Way: A Homemade Rehydration Drink
The World Health Organization’s oral rehydration formula is the gold standard for replacing electrolytes quickly. The key principle: glucose acts as a carrier that helps your intestines absorb sodium and water much faster than water alone. You can make a version at home with ingredients you already have.
Sugar and salt recipe (WHO-based):
- 4¼ cups (just over 1 liter) of water
- ½ teaspoon (3 g) of table salt
- 2 tablespoons (30 g) of sugar
Mix until everything dissolves completely. That’s it. Store it in the fridge and use it within 24 hours, or within 12 hours if kept at room temperature.
Juice-based version:
- 4 cups (1 L) of water
- 1 cup (250 mL) of 100% orange juice
- 2 tablespoons plus 2 teaspoons (40 g) of sugar
- ¾ teaspoon (4.5 g) of baking soda
- ½ teaspoon (3 g) of salt
The orange juice version adds potassium and tastes better. Either way, the measurements matter. Too much salt makes it less effective (and unpleasant), while too little won’t replace what you’ve lost. Measure carefully rather than eyeballing it.
Restoring Electrolytes Through Food
For everyday replenishment, food is your best tool. It delivers electrolytes in balanced proportions alongside other nutrients that help absorption. The key sources, organized by mineral:
- Potassium: Bananas, potatoes, sweet potatoes, beans, spinach, avocados, and coconut water. Adults need 2,600 mg (women) to 3,400 mg (men) daily, and most people fall short.
- Magnesium: Dark leafy greens, nuts, seeds, dark chocolate, and fatty fish. Women need 310 to 320 mg per day, men need 400 to 420 mg.
- Calcium: Dairy products, fortified plant milks, leafy greens, and canned fish with bones. The target is 1,000 mg daily for most adults, rising to 1,200 mg for women over 50 and men over 70.
- Sodium: Most people get plenty from regular food. The recommended limit is under 2,300 mg per day. Adding extra salt is only necessary after heavy, prolonged sweating or during illness with fluid loss.
Coconut water stands out as a natural electrolyte drink because it’s rich in potassium, sodium, magnesium, and phosphorus without added sugar. It works well as a post-workout option for moderate exercise. Pickle juice and bone broth are high in sodium specifically, making them useful after heavy sweating.
Timing Around Exercise
Start hydrated. Drinking 400 to 600 mL of fluid (roughly 1.5 to 2.5 cups) about two hours before exercise gives your body time to absorb the fluid and pass any excess. During exercise, aim for 150 to 300 mL (about half a cup to a cup) every 15 to 20 minutes, adjusting based on how much you sweat.
Here’s something most people don’t realize: for exercise under 90 minutes, plain water is enough. Your body has sufficient electrolyte reserves, and normal meals afterward will replenish what you lost. Electrolyte drinks become genuinely useful during prolonged exercise lasting longer than 90 minutes, during the first few days of training in hot weather, or when you haven’t eaten enough that day to cover losses through food.
After a long or intense session, the priority is replacing both fluid and sodium. Salty foods with a large glass of water, or one of the rehydration drinks above, will do the job. Adding potassium-rich foods like a banana or some orange juice rounds out the recovery.
Recovering After Illness
Vomiting and diarrhea create a more urgent situation than exercise because losses can be rapid and continuous. The WHO recommends rehydrating over a 4-hour period using oral rehydration solution, sipping small amounts frequently rather than gulping large volumes (which can trigger more vomiting).
For ongoing diarrhea, drink about 5 mL per kilogram of body weight after each large watery stool. For a 70 kg (154 lb) adult, that’s roughly 350 mL, or about 1.5 cups. The goal isn’t to replace everything at once but to keep pace with what you’re losing. Once the vomiting or diarrhea stops, your body typically rebalances within a day or two as you return to normal eating and drinking.
Commercial electrolyte products designed for illness recovery (like Pedialyte) follow similar formulas to the WHO recipe. They’re convenient but not inherently better than a carefully measured homemade version.
Risks of Overdoing It
More is not better with electrolytes, especially potassium. Healthy kidneys can handle a gradually increasing potassium load, but a sudden large dose can be dangerous. Potassium levels above 6.0 millimoles per liter in the blood can cause life-threatening heart rhythm problems, and this threshold can be reached surprisingly fast. Salt substitutes (the kind marketed as low-sodium alternatives for cooking) contain about 70 milliequivalents of potassium chloride per teaspoon, enough to cause serious harm in someone with impaired kidney function.
People with kidney disease, heart failure, or those taking certain blood pressure medications are at the highest risk for potassium overload. If you have any of these conditions, electrolyte supplements or salt substitutes deserve a conversation with your doctor before you start using them regularly.
For most healthy people, the real risk isn’t toxicity from food sources. It’s overdoing concentrated supplements or electrolyte powders that pack large doses into a small serving. Stick to the recommended serving sizes, and when in doubt, get your electrolytes from whole foods where the doses are naturally moderate and balanced.