Plain electrolytes like sodium, potassium and magnesium don't break a fast, and they can make fasting much easier. When you fast, your body releases more sodium through the kidneys, which is a big reason fasters get headaches, fatigue, lightheadedness and cramps. Replacing those minerals is one of the simplest ways to feel better while you fast.
Why you lose electrolytes when you fast
When you stop eating, your insulin levels drop. Insulin normally signals your kidneys to hold on to sodium, so when it falls, your kidneys let more sodium go, and water follows. Researchers have studied this "natriuresis of fasting" for decades (Journal of Clinical Investigation). It's also why the first few days of a low-carb diet or a longer fast often bring the so-called "keto flu."
Signs you need electrolytes while fasting
- Headache, especially in the afternoon
- Fatigue or brain fog
- Lightheadedness when you stand up
- Muscle cramps or twitches
- Strong salt cravings
Which electrolytes matter most for fasting
- Sodium is the big one, since it's what your kidneys release most when insulin drops.
- Potassium works alongside sodium to keep your fluid balance and muscles working.
- Magnesium supports muscles and nerves and is a common shortfall in modern diets.
Do electrolytes break a fast?
Pure minerals have no calories, so plain electrolytes don't break a fast. Flavored electrolyte drinks are different: anything with sugar, juice or calories technically ends a strict fast.
Here's the honest version for ours: our Premium Electrolyte Mix has 15 calories and 1g of sugar per stick (20 calories and 4g in Mixed Berry), from real organic fruit. If you're doing a strict water fast or fasting for a medical reason, that counts, and plain salt water is the purest choice. Many people doing everyday intermittent fasting for energy and focus are comfortable with a small amount of calories and use a stick during their fasting window to get through it. You know your goals best.
How to take electrolytes while fasting
- Morning: start with a big glass of water and electrolytes. See Adding Salt to Water for Hydration for a simple pinch-of-salt option.
- Afternoon: if a headache or energy dip shows up, have another serving.
- Around workouts: if you train fasted, take electrolytes before or during.
- Break your fast gently with real food: eggs, meat, broth, vegetables.
What about coffee while fasting?
Black coffee is a fasting staple. Our Signature Mushroom Coffee Blend has 5 calories per scoop and no sugar or sweeteners. See Does Mushroom Coffee Break a Fast?
Our Premium Electrolyte Mix
Each stick has 1,000mg of sodium from Himalayan rock salt, 800mg of potassium, 100mg of magnesium glycinate, 1g of taurine and organic Irish sea moss. It's flavored with real organic fruit and sweetened with organic monk fruit, with no artificial sweeteners, dyes, "natural flavors" or anti-caking agents. Every batch is third-party tested for mold, mycotoxins, glyphosate and heavy metals.
Shop the Premium Electrolyte Mix → Subscribe and save 25% for life, plus a free gift with your first subscription.
Frequently asked questions
Do electrolytes break a fast?
Plain electrolytes (minerals only) don't. Flavored drinks with sugar or calories technically do, though many intermittent fasters are fine with a small amount.
What electrolytes should I take while fasting?
Sodium first, then potassium and magnesium.
Why do I get headaches when fasting?
Often because you're losing sodium and water as insulin drops. Electrolytes and water usually help.
Can I drink salt water while fasting?
Yes. A pinch of quality salt in water is the simplest zero-calorie electrolyte.
Does the Premium Electrolyte Mix break a fast?
It has 15 to 20 calories and 1 to 4g of sugar per stick, so it technically ends a strict fast. Many people doing intermittent fasting still use it.