Not getting enough electrolytes and water
Due to a process is known as glycogen depletion, you'll definitely quick weight loss and frequent urination when starting a ketogenic diet. You lose more salt in your urine as a result of the way ketosis affects your kidneys. When starting a ketogenic diet, drink lots of water and add salt to your meals to replace what you've lost and avoid the "keto fever."
You can detect how hydrated you are by the color of your urine: the deeper the yellow, the more dehydrated you are. Consult your doctor to determine if you need to increase your sodium intake on a ketogenic diet, and use a potassium-fortified salt to acquire both electrolytes at the same time.