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Leg Cramps on Keto (and How to Prevent Them)

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  Published on June 23rd, 2020
  Reading time: 3 minutes
  Last modified January 25th, 2023
leg cramps on keto

Why do some people experience leg cramps on keto? What could be causing these muscle spasms and how can you prevent it? Cramps are localized, involuntary muscle contractions that can be painful. They’re most common in the legs. Leg cramps can last several seconds or a few minutes. Most leg cramps are over in a few minutes [1].
Let’s delve into some possible reasons why this might happen and what you can do about it.

What Causes Muscle Cramps or Spasms on Keto?

People experience keto-related muscle spasms or leg cramps for several reasons, usually due to an essential mineral imbalance. The exact cause isn’t always clear and certain other general factors, such as insufficient blood flow, might also play a role [2].

1) Electrolyte Imbalance

When you reduce the carbohydrates in your diet, your body produces less insulin. The insulin hormone helps you process and store the sugar you eat and the foods that turn to sugar in your body (carbs). When you reduce the need for insulin, this triggers your kidneys to absorb less sodium, and more sodium is released in your urine. This can lead to sodium deficiency and electrolyte imbalance [3] [4].

Electrolytes are positively charged minerals that fuel hundreds of bodily processes. Electrolytes include magnesium, sodium, potassium, and calcium. If your levels of these important electrolytes are depleted, your nerve cells might become more sensitive, leading to pressure on nerve endings that might cause muscle spasms [5] [6]. Of all the electrolytes, low magnesium is also one of the most likely to cause muscle contractions and spasms.

You might lose more electrolytes through urination when you’re adapting to the keto diet. This is in response to the decreased levels of blood sugar and the insulin hormone. The electrolyte loss is typically greater during the first 1-4 days of transitioning to the ketogenic diet, so keto-related muscle spasms are worse during this time.

2) Dehydration

Transitioning to the keto diet often results in increased urination due to certain factors, such as increased sodium excretion and reduced insulin levels. This increased urination can lead to dehydration — another possible cause of muscle spasm. Dehydration is a common keto side effect that might increase your risk of leg cramps, so make sure you’re drinking plenty of water and staying hydrated [7] [8].

3) Caffeine!

Drinking too much coffee can increase your risk of getting leg cramps when you start keto since caffeine stimulates your muscles to contract. Caffeine is also a diuretic, so it helps take water out of your body, which can lead to muscle cramping and dehydration [9] [10] [11]

4) Exercising Without Hydrating

If you’re exercising, you lose both water and electrolytes in your sweat. Make sure you’re hydrated and getting sufficient electrolytes! [12].

5) Other Possible Causes

Other possible causes of muscle spasms that aren’t necessarily related to the ketogenic diet include certain medications, such as diuretics, statins, and asthma drugs, sedentary habits, strenuous physical activity, and medical conditions, such as kidney and liver failure [13] [14] [15].

Top Tips for Preventing Muscle Cramps on Keto!

Here are some useful tips for preventing muscle spasms on keto:

  • Replenish your electrolytes with foods and supplements if needed
  • Consume bone broth
  • Salt your food to replenish sodium
  • Drink plenty of water and stay hydrated
  • Engage in gentle exercise and keep moving
  • Cut back on or avoid alcohol, caffeine, and other diuretics

On keto, you have a plethora of low-carb, electrolyte-rich foods to choose from. For example, for potassium, eat swiss chard, avocados, onions, spinach, tomatoes, mushrooms, and beet greens to rebalance your electrolyte levels. For magnesium, you can eat pumpkin seeds, cashews, Brazil nuts, arugula, kale, broccoli, and oysters [16] [17].

If you have severe or persistent muscle spasms, you should visit your health care practitioner to rule out an underlying problem.

Do You Experience Leg Cramps or Muscle Spasms on Keto?

What are your top tips for preventing muscle spasms when transitioning to the ketogenic diet? How do you avoid the keto flu?

Steph Green is a content writer specializing in and passionate about healthcare, wellness, and nutrition. Steph has worked with marketing agencies, written medical books for doctors like ‘Untangling the Web of Dysfunction,’ and her poetry book ‘Words that Might Mean Something.’ In 2016, after four years of struggling with her own health problems and painful autoimmune disease, Steph developed a life-changing and extensive knowledge of keto, nutrition, and natural medicine. She continues on her healing journey and enjoys helping others along the way.



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Molema, M., Dekker, M. C. J., Voermans, N. C., Engelen, B. G. M., & Van Aarnoutse, R. E. (2007).Caffeine and muscle cramps: A stimulating connection.American Journal of Medicine, 120(8), 1-2.


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Delacour, C., Chambe, J., Lefebvre, F., Bodot, C., Bigerel, E., Epifani, L., Granda, C., Haller, D. M., & Maisonneuve, H. (2018). Association between alcohol consumption and nocturnal leg cramps in patients over 60 years old: A case-control study.16(4), 296-301. 


Garrison, S. R., Dormuth, C. R., Morrow, Carney, G. A., & Khan, K. M. (2012). Nocturnal leg cramps and prescription use that precedes them: A sequence symmetry analysis.Archives of Internal Medicine, 172(2), 120-126.


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