When you first start a ketogenic diet, you may temporarily experience flu-like symptoms such as dizziness, brain fog, irritability, stomach trouble, insomnia, and more, as your body switches from burning glucose to burning fat. These symptoms can occur for a few days up to a few weeks and are a natural reaction that you’re encouraged to push through. You can alleviate symptoms by increasing hydration, electrolytes, and natural salt consumption. Get lots of rest and exercise gently. Lastly, consuming activated charcoal binds any toxins stored in the fat you’re shedding and can reduce nasty detox symptoms.