Electrolytes: Why Drinking More Water Isn't Always the Answer

One of the most common things I heard behind the counter wasn't "I need a protein powder" or "what do you have for energy." It was some version of: "I drink so much water — why do I still feel terrible after my workouts?"

The answer, more often than not, was electrolytes. Not the neon-colored sports drink version — the actual minerals that your body depends on to function, and that most people are chronically running low on without ever knowing it.

This isn't a post about a trendy supplement category. Electrolytes are foundational biology. But the way most people think about hydration — "drink more water" — misses half the picture. Here's the other half.

What Electrolytes Actually Are

Electrolytes are minerals that carry an electric charge when dissolved in water — which is exactly what happens inside your body. That charge is what allows them to do their jobs: conducting nerve impulses, triggering muscle contractions, regulating fluid balance, and maintaining your blood's pH within the narrow range that keeps you alive.

The key electrolytes and what they do:

• Sodium — The most important for hydration. Regulates fluid balance inside and outside cells, drives nerve signaling, and is the primary electrolyte lost through sweat. Most people don't get enough when they're sweating heavily.
• Potassium — Works in direct balance with sodium. Critical for heart rhythm, muscle contraction, and blood pressure regulation. Low potassium is one of the most common contributors to muscle cramps.
• Magnesium — Involved in over 300 enzymatic reactions. Especially important for muscle relaxation, energy production, and nerve function. Also lost through sweat, and a large percentage of people are already marginally deficient from diet alone.
• Chloride — Usually comes paired with sodium (as sodium chloride — salt). Helps maintain fluid balance and is a component of stomach acid.
• Calcium — Not just bones. Also required for muscle contractions to initiate and terminate properly. Low calcium can contribute to cramping and abnormal heart rhythms.

These aren't exotic or optional. Every heartbeat, every muscle contraction, every nerve signal running from your brain to your fingertips depends on electrolytes. They're as fundamental as oxygen.

How You Lose Electrolytes

The problem isn't that your body runs out of electrolytes in some dramatic way. It's that most people lose them steadily throughout the day and rarely replace them adequately.

Sweat is the biggest culprit. Every time you sweat, you're not just losing water — you're losing sodium, potassium, magnesium, and chloride in meaningful amounts. A single hour of moderate exercise in warm weather can result in the loss of 1,000–2,000mg of sodium alone. Individual sweat rates vary enormously — some people are "salty sweaters" who lose substantially more sodium per liter of sweat than average — but everyone loses electrolytes when they sweat, every time.

Caffeine and alcohol both increase electrolyte loss through their diuretic effect, which drives increased urinary output. If you drink two or three coffees a day — and most people do — you're accelerating your electrolyte turnover beyond what's obvious from sweat alone.

Low-sodium diets have become common under the (often oversimplified) public health message that salt is bad for you. For most active, healthy people who aren't hypertensive, restricting sodium while also sweating regularly creates a deficit that plain water absolutely cannot fix.

Heat stress at rest causes electrolyte loss even when you're not exercising. Sitting outside on a hot day or working in a warm environment will drive sweat output that most people don't account for because it doesn't feel as dramatic as a gym session.

Electrolytes During Workouts

For workouts under 45–60 minutes at moderate intensity in a climate-controlled environment, water is probably fine. Your glycogen and electrolyte stores are sufficient for short efforts, and the losses aren't dramatic enough to impair performance.

Past that threshold — longer sessions, high-intensity training, outdoor exercise in warm weather, or anything that generates significant sweat — electrolytes start to matter quite a bit.

Performance degrades before you feel it. Research consistently shows that even mild electrolyte depletion — before obvious cramping or fatigue sets in — measurably reduces strength output, endurance capacity, and cognitive performance during exercise. You're not always going to feel the deficit in an obvious way. You might just have a flat workout and not know why.

Cramps are not always a water problem. The traditional explanation for exercise-induced muscle cramps was dehydration. More recent research, including a notable study of NFL players by Stofan et al., found that the athletes who cramped were those with the highest sodium losses in sweat — not necessarily those who were most dehydrated. Sodium drives the electrical gradients that allow muscles to contract and relax normally. When it drops significantly, that signaling breaks down, and cramping follows. If you cramp regularly during training, sodium is worth examining before anything else.

What to do:

• For sessions over 60 minutes or in significant heat: use an electrolyte drink or add electrolytes to your water — don't just drink plain water
• Look for products with meaningful sodium content: at least 300–500mg of sodium per serving, not just potassium and magnesium
• Pre-hydrate with electrolytes for morning workouts — overnight you've already been fasting and not replacing sweat losses from the previous day
• After intense or long sessions, replace electrolytes within the first 30–60 minutes alongside carbohydrates and protein

Summer Heat: A Different Kind of Demand

Exercise is obvious. Summer heat is subtler — and that's what makes it more dangerous.

On a hot day, your body loses electrolytes continuously through sweat even while doing nothing strenuous. Walking to your car, sitting outside, doing yard work in the afternoon — all of it drives sweat output at a rate most people don't consciously track because it doesn't feel like "working out."

The consequences of prolonged electrolyte depletion in the heat follow a predictable progression. Heat cramps — painful, involuntary muscle spasms — are usually the first sign that sodium and potassium have dropped significantly. Left unaddressed, this can escalate to heat exhaustion: heavy sweating, weakness, cold or pale skin, a rapid and weak pulse, nausea, and possible fainting. At the extreme end is heat stroke, a medical emergency where the body's temperature regulation fails entirely.

The groups most at risk are older adults (who have a blunted thirst response and often take medications that affect fluid balance), young children, outdoor workers, and anyone who is unaccustomed to the heat and hasn't had time to acclimatize. But heat-related illness isn't limited to those populations — it's simply more common in them.

Daily Electrolytes: Not Just for Athletes

This is the part most people miss. Electrolyte balance isn't just a concern for marathon runners or people spending August outdoors. It's a daily maintenance issue for everyone.

The signs of low-grade, chronic electrolyte depletion are easy to dismiss or misattribute:

• Persistent fatigue that doesn't improve with more sleep
• Morning headaches, especially on days after drinking alcohol or caffeine-heavy days
• Muscle twitches — especially in the eyelids, calves, or feet at rest
• Brain fog and difficulty concentrating
• Feeling anxious or on edge without a clear reason (low magnesium in particular has a well-documented relationship with anxiety and nervous system hyperactivity)
• Irregular heartbeat or palpitations at rest (worth ruling out medically, but low potassium and magnesium are common contributing factors)

None of these symptoms are dramatic enough to send you to the doctor. They're the kind of thing that becomes your new normal — the background hum of not quite feeling right that you eventually stop noticing. Correcting electrolyte status often resolves these things within a few days, which is either gratifying or a little frustrating depending on how long you've been tolerating them.

The modern diet is particularly poor at covering electrolyte needs. Ultra-processed foods — while often high in sodium — are low in potassium and magnesium. If you eat well but avoid processed food and don't add salt to your cooking, you may actually be running short on sodium. If you eat plenty of processed food but few vegetables, your potassium and magnesium are likely insufficient. There's no single dietary profile that guarantees adequate electrolyte intake without some deliberate attention to it.

Sports Drinks vs. Electrolyte Supplements vs. Food

Not all electrolyte sources are equal, and the options range from excellent to essentially useless for this purpose.

Traditional sports drinks (the neon-colored ones you've seen since the 1980s) have the right idea — sodium, potassium, some carbohydrates for fuel — but the execution is often poor. Most contain more sugar than necessary for anything outside of endurance events lasting multiple hours, and the sodium content is typically low relative to actual sweat losses. They're better than nothing. They're not the best option.

Electrolyte powders and tablets are a significantly better choice for most scenarios. Look for products that lead with sodium — at least 300–500mg per serving — and include potassium and magnesium. Be skeptical of products with proprietary blends that hide the actual mineral amounts, or products that lead with vitamins and minerals while including only token electrolyte quantities. The label should clearly state the milligrams of each electrolyte, not just that they're "included."

Whole foods are ideal for potassium and magnesium specifically. Avocados, bananas, sweet potatoes, leafy greens, nuts and seeds, legumes — these are the primary dietary sources of potassium and magnesium that most people don't eat in adequate amounts. You cannot meaningfully replace whole-food potassium intake with a supplement alone — the amounts needed are too large.

Salt itself deserves rehabilitation in this conversation. Quality sea salt or Himalayan pink salt on food — used at the level that makes food taste good — is not a health risk for most healthy, active people. The public health concern around sodium is primarily directed at sedentary individuals with hypertension consuming enormous amounts through processed food. For active people sweating regularly, modest salt use on whole food is not just acceptable — it's physiologically appropriate.

A Practical Starting Point

Electrolytes don't require a complicated protocol. Here's what I'd actually tell someone who came into my store asking about this:

On workout days involving more than an hour of training, outdoor exercise, or anything generating significant sweat: add an electrolyte product to your water during or after the session. Don't rely on plain water. Pay attention to how you feel in the 24 hours after — it's often more revealing than how you feel during.

During summer — not just on workout days, but every day — increase your baseline electrolyte intake. Start your morning with a pinch of sea salt in your water or a proper electrolyte drink. Eat more potassium-rich foods. Don't be afraid of salt on your food. This is the simplest and most impactful adjustment most people can make.

For daily baseline: prioritize whole foods for potassium and magnesium, use salt on your food without anxiety, and pay attention to how caffeine and alcohol consumption is affecting your overall mineral balance. Two coffees and a glass of wine in the evening, daily, meaningfully accelerates your depletion — not in a way that requires you to stop, but in a way that requires you to replace what you're losing.

If you cramp regularly, look at sodium first. If you're anxious, have trouble sleeping, or experience frequent muscle twitches, look at magnesium. If your heart feels fluttery at rest (worth getting checked medically), potassium and magnesium are both worth examining. These symptoms don't always have a mineral deficiency at the root — but they often do, and it's the easiest thing to rule out.

The body runs on electrolytes the same way a car runs on oil — quietly, invisibly, until it doesn't. Most people never think about it until something goes wrong. The goal is to never reach that point.