Muscle cramps, headache and heart palpitations: electrolytes by symptom
Day three on the method: your head is pounding, your legs feel like cotton, your calf cramped at night, and in the morning your vision darkened when you stood up. The first thought is — "this is not for me." The correct one is — "I am lacking three minerals." Sodium, potassium and magnesium are lost faster than they are replenished during the first weeks, and each symptom points to one of them. Section — electrolytes and water.
Symptom — cause — action
| Symptom | Most likely | Do this today | Time frame |
|---|---|---|---|
| Headache, brain fog, sluggishness | sodium, water | a glass of water with 1/4 tsp of salt, repeat after 2 hours; add salt to food | hours |
| Vision darkens when standing up, heart palpitations | sodium, water | salt up to 3-5 g, water 2-3 l | 1-2 days |
| Calf and foot cramps at night | magnesium, then potassium | magnesium 300-400 mg in the evening, avocado and leafy greens | 3-7 days |
| Eyelid twitching, anxiety, poor sleep | magnesium | magnesium glycinate in the evening | one week |
| Muscle weakness, "legs won't move" | potassium, sodium | avocado, salmon, leafy greens; salt | 2-3 days |
| Constipation | magnesium, water, salt | magnesium citrate, water, vegetables | 2-3 days |
| Increased resting pulse | sodium, potassium, magnesium | all three plus water; if it does not go away — see a doctor | 1-2 days |
Why this is not "intolerance"
When insulin drops, the kidneys stop retaining sodium — and water, potassium and magnesium leave with it. Symptoms appear on days 2-5 and go away as soon as the electrolytes are replenished. This is confirmed by both physiology and thousands of people who got through the first week with salt and without it. The difference between "the method is not for me" and "the method works" is a quarter teaspoon of salt in a glass. All the initial symptoms — keto flu, the basics about minerals — electrolytes on LCHF.
Protocol for the first two weeks
Morning: a glass of water with a quarter teaspoon of salt and lemon. Food: salt to taste, one avocado a day, leafy greens with every meal, salmon or mackerel twice a week. Evening: magnesium 300-400 mg. Water 2-3 liters, more in hot weather and during exercise, with salt. After two weeks, most symptoms go away, and the protocol becomes a habit rather than treatment. Details on each: salt, potassium, magnesium.
When it is not electrolytes — see a doctor
- Heart palpitations do not go away within a day after salt and water
- The cramps are not in the calves but in the chest or arm
- Fainting rather than darkening vision
- Symptoms persist for more than two weeks despite proper electrolytes
- You take diuretics, blood sugar-lowering medication or blood pressure medication — the doses may need adjustment
Frequently asked questions
Ready-made electrolytes from a sports store?
They are suitable if they are sugar-free. Check the composition: sodium 500+ mg, potassium 200-400, magnesium 100+ per serving. Cheaper options are salt, avocado and magnesium.
I drink a lot of water, but my headache gets worse.
Water without salt washes out even more sodium. Add salt to the water — and the headache will go away.
Cramps during workouts rather than at night?
Salt and water 30 minutes before exercise, magnesium in the evening. During long workouts — salt during the workout as well.
- What You Need and What You Don’t
- Vitamins and Minerals
- Electrolytes and Hydration
Reviewed by Anastasia Zhukova, Fitness Trainer • Author of a Nutrition and Training System • Creator of an AI Personal Support Platform
A human has reviewed this material against the method and real client practice.