08/20/2026
Electrolyte balance is one of the most misunderstood pieces when starting a low carb or ketogenic diet.
Many people think they feel horrible because of their lowered carb limit, particularly when they are entering ketosis. More often than not, their electrolytes are out of whack.
When carbohydrate intake drops, insulin levels generally decrease. The kidneys tend to excrete more sodium and water, which can increase the loss of electrolytes. This is one reason some people experience the so-called “keto flu”—headaches, fatigue, dizziness, muscle cramps, or feeling generally sluggish.
The three key electrolytes are:
Sodium: Helps maintain fluid balance, blood volume, nerve signaling, and muscle contraction. Low-carb eating can increase sodium losses. Salt your food.
Potassium: Important for muscle function, nerve transmission and normal heart rhythm. Plant-based diets can provide plenty through avocado, leafy greens, mushrooms, nuts, seeds and other vegetables.
Magnesium: Supports hundreds of enzymatic reactions, including energy metabolism, muscle and nerve function. Nuts, seeds, leafy greens and cacao are useful sources.
A plant-based ketogenic diet can be very nutrient-dense, but food choices matter. Because the diet emphasizes vegetables, nuts, seeds and other whole plant foods, potassium and magnesium intake can be quite good. Sodium may be the electrolyte that requires the most attention, particularly if someone is eating mostly unprocessed foods and isn't adding salt.
However, more electrolytes aren't automatically better. People with kidney disease, heart failure, high blood pressure, or medications that affect sodium or potassium should discuss electrolyte supplementation with their healthcare professional rather than routinely adding large amounts.
Remember...hydration plus adequate electrolytes can make a significant difference in how someone feels on a low-carb ketogenic diet. Prioritize electrolyte-rich whole foods, adequate fluids, and individualized sodium intake, and use an electrolyte supplement if needed.