The Complete Guide to Electrolytes and Hydration
Complete Guide · 2026
The Complete
Guide to Electrolytes
What they are, why your body needs them, and how to get enough -through food, hydration, and the right supplements.
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You've had six glasses of water today. So why do you still feel tired, foggy, or crampy?
Water alone doesn't hydrate you at the cellular level. What activates that hydration is something most of us barely think about: electrolytes.
What Are Electrolytes?
Electrolytes are minerals that dissolve in fluid and carry an electrical charge. That charge is what allows them to trigger nerve signals, move water in and out of your cells, and keep your muscles firing properly.
Think of them as the electrical wiring inside your body. Water is the conductor. But without the right minerals running through it, the signal doesn't travel.
Sodium
Fluid balance & nerve signals
Key Ion
Potassium
Muscle contraction & heart function
Key Ion
Magnesium
Muscle relaxation & energy production
Key Ion
Calcium
Muscle contraction & bone health
Key Ion
Chloride
Fluid balance & digestion
Key Ion
| Electrolyte | Primary Role | Best Food Source |
|---|---|---|
| Sodium | Fluid balance, nerve signals | Sea salt, broth, olives |
| Potassium | Muscle contraction, heart function | Avocado, sweet potato, spinach |
| Magnesium | Muscle relaxation, energy production | Pumpkin seeds, dark chocolate, almonds |
| Calcium | Muscle contraction, bone health | Dairy, sardines, kale |
| Chloride | Fluid balance, digestion | Table salt, seaweed, celery |
Important: It's not just about having these minerals; it's about having them in the right balance. Too much of one and too little of another causes problems just as much as being low across the board.
Section 02What Do Electrolytes Do In Your Body?
Electrolytes control six critical functions in your body. When the levels drop, all six are affected.
01
Fluid Balance
Sodium and potassium control water distribution inside and outside cells via osmosis. You can drink litres of water and still be dehydrated at the cellular level.
02
Nerve Signals
Every reflex and heartbeat runs through the sodium-potassium pump. Low electrolytes mean slower reactions, poor coordination, and reduced mental sharpness.
03
Muscle Contraction
Calcium triggers contractions; magnesium regulates release. Imbalance causes cramps (not because muscles are tight) but because the cellular mechanism is misfiring.
04
pH Balance
Your blood needs a pH of 7.35–7.45. Electrolytes (especially bicarbonate) maintain this. A slight slip causes nausea, fatigue, and confusion.
05
Brain Function
The brain is 73% water and extremely sensitive to electrolyte shifts. Low sodium is one of the most underdiagnosed causes of brain fog.
06
Energy Production
Magnesium is directly involved in how mitochondria produce ATP (your body's primary energy currency). Low magnesium consistently links to fatigue even with normal sleep and iron.
Signs You Might Be Low
These symptoms are easy to dismiss or blame on other things. If you're experiencing more than one regularly, electrolyte deficiency is worth investigating.
Muscle Cramps & Spasms
Usually tied to low potassium or magnesium. Night cramps in the legs are a very common low-magnesium signal most people never connect to their diet.
Persistent Fatigue
A flat, heavy fatigue that doesn't improve with sleep. Often linked to low sodium or magnesium, and commonly misattributed to stress or iron deficiency.
Headaches
Particularly common after workouts or heat exposure. Drinking more water without replacing electrolytes often makes the headache worse, not better.
Nausea & Dizziness
Low sodium (hyponatremia) is one of the most common causes of dizziness in people who exercise regularly and hydrate with plain water.
Brain Fog
Difficulty forming clear thoughts, slow reactions. Electrolyte imbalance, particularly low sodium, directly reduces neural efficiency.
Heart Palpitations
An irregular or fluttery heartbeat can be a sign of low potassium or magnesium, especially during or after exercise.
Note: General dehydration and electrolyte deficiency feel similar but are different problems. Drinking water fixes the former. If you're already well-hydrated and still feel these symptoms, more water won't help rather it can actually dilute sodium further and make things worse.
Who Needs More Than Most?
Certain groups lose electrolytes faster, absorb less from food, or have higher baseline needs. If you fall into any of these categories, standard dietary intake is unlikely to be enough.
Athletes & Regular Gym-goers
Sweat contains ~700–900mg sodium per litre. A 90-min session can deplete more sodium than a typical whole-food meal replaces. If you train 4+ times weekly, your needs are significantly higher.
Hot Climates & Outdoor Workers
Increased climate-related heat exposure in 2026 means outdoor workers and commuters lose electrolytes passively all day and not just during exercise.
Keto & Low-Carb Dieters
Lower insulin causes the kidneys to excrete more sodium, triggering a cascade that depletes potassium and magnesium. The "keto flu" is largely an electrolyte problem.
GLP-1 Users (Ozempic, Wegovy)
Reduced appetite means significantly reduced food volume and therefore less dietary electrolyte intake. A growing and underserved concern, especially when combined with exercise.
Older Adults
Kidney efficiency declines with age, making it harder to retain sodium. Thirst signals also become less reliable, meaning depletion can happen gradually without obvious warning signs.
Intermittent Fasters
Extended fasting windows, especially 16:8 or longer, combined with exercise accelerate electrolyte loss. Many people doing IF feel flat or foggy without realising this is the reason.
Best Food Sources of Electrolytes
For most people eating a varied, whole-food diet, a significant portion of daily needs can be met through food. Here's a practical breakdown.
| Electrolyte | Best Food Sources | Daily Target |
|---|---|---|
| Sodium | Sea salt, miso, broth, olives, canned fish | 1,500–2,300mg |
| Potassium | Avocado, sweet potato, white potato, spinach, coconut water | 2,600–3,400mg |
| Magnesium | Pumpkin seeds, almonds, dark chocolate, black beans, spinach | 310–420mg |
| Calcium | Dairy, fortified plant milk, sardines, kale, broccoli | 1,000–1,200mg |
| Chloride | Table salt, seaweed, celery, tomatoes | 1,800–2,300mg |
Banana myth: A medium banana contains ~422mg potassium. A medium avocado has nearly 700mg, and a baked potato with skin has over 900mg. Bananas are fine, they're just not the optimal choice if potassium is your actual goal. Also note: magnesium is the most commonly depleted electrolyte in modern diets due to decades of intensive farming reducing soil mineral content.
Electrolyte Supplements: When & How
The supplement market has expanded significantly. The options are genuinely good but so is the noise. Here's how to cut through it.
🥄
Powders
Maximum dose control
Easy to mix with water
Best for daily gym use
Usually sugar-free options
Less portable than tablets
💊
Tablets
Highly portable
Great for travel & events
Easy to carry in gym bag
Less dosage flexibility
Slower to dissolve
🥤
RTD Drinks
Most convenient option
Ready to grab-and-go
Most expensive per serving
Often higher in sugar
Typically less sodium
What to Look For on the Label
✅ Minimum 300mg sodium per serving (for training)
✅ Potassium AND magnesium included
✅ Low or no added sugar
✅ No artificial dyes or unnecessary fillers
✅ Transparent individual dosing (no proprietary blends)
❌ Avoid brands that hide amounts in "proprietary blends"
When Supplementing Makes Sense
🏃 Training sessions over 60 minutes
🌡️ Exercise in hot or humid conditions
🤒 Illness with vomiting or diarrhoea
⏱️ Fasting windows longer than 16 hours
✈️ Long-haul travel or flying
💦 Days of heavy sweating regardless of exercise
How Much Do You Actually Need?
These are standard daily baselines for active people, those in heat, and the groups covered above will need more.
Daily Electrolyte Targets at a Glance
| Electrolyte | Daily Target (Sedentary) | Notes |
|---|---|---|
| Sodium | 1,500–2,300mg | Up to double for heavy training days |
| Potassium | 2,600mg (women) / 3,400mg (men) | Most people don't hit this from food alone |
| Magnesium | 310–320mg (women) / 400–420mg (men) | Most depleted electrolyte in modern diets |
| Calcium | 1,000–1,200mg | Absorption improved with adequate vitamin D |
| Chloride | 1,800–2,300mg | Usually covered by sodium intake |
Sources: WHO, National Institutes of Health (NIH) Office of Dietary Supplements
The practical rule for active people: Replace what you lose through sweat, not just what satisfies thirst. Thirst is a lagging indicator: by the time you feel thirsty, you've typically already lost 1–2% of body water. Every litre of sweat contains roughly 700–900mg of sodium. A two-hour session in warm conditions can easily double your daily sodium needs on that day alone.
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Electrolytes
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Frequently Asked Questions
Are electrolytes the same as hydration? ▾
No. Hydration refers to your body's water content. Electrolytes are the minerals that make that water functional at the cellular level. You can be well-hydrated and still have an electrolyte imbalance and vice versa.
Can you have too many electrolytes? ▾
Yes, though it's uncommon through food alone. Excessive sodium from supplements can raise blood pressure. High potassium intake can stress the kidneys, particularly in people with existing kidney conditions. Stick to recommended doses and don't stack multiple supplement products without checking combined sodium totals.
Do I need electrolytes if I don't work out? ▾
Yes. Electrolytes are required for nerve function, heartbeat, digestion, and basic cellular activity regardless of how active you are. Sedentary people eating whole foods typically get enough through diet, but those on restricted or low-variety diets may consistently fall short.
What's the best time to take electrolytes? ▾
It depends on your goal. Before exercise to prepare cellular hydration. During sessions lasting longer than 60 minutes to maintain performance. After training to support recovery. For general daily wellness, with meals is fine.
Are sugar-free electrolytes effective? ▾
Yes. The minerals, sodium, potassium, magnesium, are what do the work, not the sugar. Sugar in traditional sports drinks improves taste and provides quick energy during endurance events, but it isn't required for hydration. Sugar-free electrolyte supplements are the cleaner and equally effective option for most people.
The Short Version
Electrolytes are not a gym supplement. They are essential minerals that every person needs every day to function: for clear thinking, steady energy, muscle control, and basic cellular health.
Most people are running lower than they realise. Not because they're doing anything dramatically wrong, but because modern diets, busy lifestyles, and increased heat exposure make it harder to consistently replenish what the body uses.
- Prioritise whole foods rich in potassium and magnesium
- Don't fear sodium if you're active and sweating
- Consider a clean supplement on training days
- Supplement during heat exposure and long fasting windows
- Thirst is a lagging signal
- Small, consistent habits close the gap
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