Do not use lard, palm oil, coconut oil or other oil containing saturated or trans fats, because our digestive system can not absorb them, they will be stored in the body's cells, and even the arteries. Olive oil, rapeseed oil, unsaturated vegetable oil are good fried food oil. These oils are rich in essential fatty acids, often eaten on the human immune system, but also make the brain more flexible. If you fry with butter, please choose common butter, do not use margarine.