The Cramps Showed Up on Day Four and I Wasn't Ready

That's what a coaching client told me when she reached out in her first week on carnivore. Her legs woke her up at 3 AM with cramping bad enough that she nearly quit the diet entirely. She didn't need motivation. She needed electrolytes and she needed them explained properly.

"Eat more salt" is what most beginners get told. It's not wrong, but it's incomplete. And the gap between what people are told and what they actually need is why cramps and fatigue are the most common complaint in the first 30 days of carnivore.

Why Electrolytes Get Depleted So Fast

When you cut carbohydrates, insulin drops. Insulin does a lot of things, and one of them is signal the kidneys to retain sodium. When insulin falls, the kidneys start excreting sodium more aggressively. Sodium brings water with it. That's the "water weight" people lose fast in the first week.

Here's the problem: sodium also pulls other electrolytes with it. As your body flushes sodium, it takes potassium and magnesium along for the ride. Add in the fact that most people come to carnivore from a standard diet where they were relying on plant foods for a good portion of their potassium and magnesium, and you've got a setup for a significant electrolyte deficit within days.

The symptoms of that deficit are very specific: muscle cramps (especially legs and feet at night), heart palpitations, headaches, fatigue that feels different from normal tiredness, and brain fog that doesn't lift. If any of those sound familiar, you're not failing. You're just depleted.

Sodium: More Than You Think, Timed Right

Most people need 3,000 to 5,000 mg of sodium per day on a carnivore diet. That's higher than standard dietary guidelines, and much higher than what people eat when they think they're "being healthy" on a low-sodium diet. Those guidelines were built for people eating high-carbohydrate diets where insulin-driven sodium retention keeps levels up naturally.

On carnivore, you have to replace what your kidneys are now actively excreting.

The best sources are table salt, sea salt, and salted bone broth. A teaspoon of table salt has about 2,300 mg of sodium. Most people need to add 1 to 2 teaspoons of salt to their food daily, on top of whatever sodium is naturally in their meat.

Timing matters more than people realize. If you're waking up with cramps, the issue is that your sodium levels are dropping overnight. Have a small amount of salty broth or even a pinch of salt in water before bed. It sounds strange but it works within days for most people.

Signs you're still under-salted: you feel dizzy when you stand up quickly, you get headaches in the afternoon, you feel better after eating but worse between meals. Add more before you assume something else is wrong.

Magnesium: The Most Overlooked Piece

Magnesium is where most beginners go wrong, partly because they don't think about it at all, and partly because when they do try to supplement, they pick the wrong form.

Magnesium oxide is the most common form in cheap supplements. It's also the hardest for your body to absorb, with absorption rates around 4%. At that rate, you'd need to take enormous doses to actually move the needle on your magnesium levels, and you'd get digestive distress long before you got there.

Magnesium glycinate is what I recommend. It's highly bioavailable, gentle on digestion, and crosses the blood-brain barrier well, which is why it also helps with sleep quality. For most people, 300 to 400 mg of elemental magnesium from glycinate daily is the target. Start at 200 mg and work up over a week if you're sensitive.

Magnesium malate is another solid option, particularly if fatigue is your main symptom. It supports mitochondrial energy production and is absorbed well.

Take magnesium at night. It supports muscle relaxation and sleep, and that's when you need it most for preventing overnight cramps. If nighttime cramps are your primary complaint, magnesium glycinate before bed is often the fastest fix.

Beef and salmon contain some magnesium, but not enough to meet your full needs on carnivore without supplementation. This is one area where supplementing is genuinely necessary, not optional.

Potassium: Food First, Supplements Are Tricky

Potassium is where I want you to be careful. Unlike sodium and magnesium, potassium supplementation carries real risks if done incorrectly. High-dose potassium supplements can cause heart arrhythmias, and they're regulated in doses for that reason. Over-the-counter potassium supplements are capped at 99 mg per tablet, which is a fraction of what you need daily.

Your daily potassium target is around 3,500 to 4,700 mg. You're not getting there through supplements safely, so food is the answer.

The good news is that carnivore foods contain meaningful potassium. Ground beef has about 300 mg per 4 oz serving. Salmon has about 500 mg per 6 oz. Beef liver is one of the highest sources at around 380 mg per 3 oz. Whole eggs contribute modest amounts.

Practically, eating 1.5 to 2 pounds of varied animal foods daily gets most people to a reasonable potassium intake without needing to think about it. If cramps persist despite good sodium and magnesium, that's when I look at whether someone is eating enough food overall.

One supplement that does help bridge potassium without the risks: cream of tartar. Half a teaspoon contains about 250 mg of potassium and is sometimes added to water or broth. It's not a complete solution, but it's a useful tool in the early weeks.

A Practical Starting Protocol

  • Add 1 to 2 teaspoons of salt to your food daily, distributed across meals.
  • Drink 1 to 2 cups of salted bone broth daily, especially in the first two weeks.
  • Take 300 mg of magnesium glycinate at night before bed.
  • Eat at least 1.5 pounds of varied animal foods daily to cover potassium through food.
  • If cramps wake you up, take a pinch of salt in water and a magnesium glycinate capsule at bedtime.

Most people see significant improvement within 48 to 72 hours of dialing in these three electrolytes. The carnivore diet doesn't cause cramps and fatigue because it's harmful. It causes them because the dietary transition changes how your kidneys handle minerals, and nobody warned you to compensate for that shift.

Getting your food variety right also helps naturally, since a range of animal foods covers more nutritional ground than eating only ground beef every day. And if you're dealing with ongoing fatigue beyond the first month, it's worth ruling out thyroid factors that can masquerade as electrolyte issues.

Salt your food. Take your magnesium. Eat enough. The cramps will stop.

If you have kidney disease, heart conditions, or take medications that affect electrolyte balance, you need individualized medical oversight before adjusting your electrolyte intake.