I use coconut oil, avacados, grass fed butter, olive oil, bacon fat....all of the yummy fats
I had a tip from a LCHF dietician. She told me to do three things to avoid the "keto flu":
1. Stay hydrated
2. Make sure to use salt on my food and to drink salted broth twice a day
3. Make sure to eat foods high in potassium and make sure to take magnesium
I only had a slight headache the first day; the second day I was very tired. Other than that, I was fine