Many people experience side effects beyond headaches on the keto diet, including muscle cramps, constipation, fatigue, and dizziness. These symptoms are collectively known as the keto flu.
In most instances, dehydration and electrolyte imbalances can worsen these symptoms, making prevention especially important.
Ensuring proper hydration and eating plenty of nutritious foods can help minimize your risk of dehydration. In turn, this can alleviate headaches — and prevent them from occurring in the first place.
Here are several specific tips:
- Drink plenty of water. As the initial phases of keto involve water loss, it’s important to drink adequate fluids. Aim for at least 68 ounces (2 liters) of water each day.
- Limit your alcohol intake. Alcohol is a diuretic, which means it makes you urinate more often and may increase your risk of dehydration (8).
- Eat more low carb, water-rich foods. Cucumbers, zucchini, lettuce, celery, cabbage, and raw tomatoes have a high water content, which can help you stay hydrated. Some of them are also good sources of electrolytes.
- Eat more electrolyte-rich foods. Keto-friendly foods like avocados, spinach, mushrooms, and tomatoes are high in potassium. Similarly, almonds, kale, pumpkin seeds, and oysters are high in magnesium and suitable for keto (9Trusted Source, 10).
- Salt your food. Consider lightly salting your food to reduce your risk of an electrolyte imbalance.
- Try an electrolyte supplement. Taking an electrolyte supplement may minimize your risk of dehydration and keto flu symptoms.
- Avoid intense exercise. Refrain from intense workouts during the initial days of keto, as they can stress your body and increase your likelihood of headaches.
If you continue to experience headaches after several days or weeks on the keto diet, consult a health professional to ensure that an underlying medical condition isn’t to blame.