Fat
Fats are used to absorb or get nutrients, like Fat-soluble Vitamins for humans. They are used as a source of backup energy in cases when carbohydrates are not available, or people can not use it at that time. People need more than 20 to 35% of daily calories from fat. Also, fats play a role in helping people's body maintain or keep the core (center) temperature. However, too much fat or the wrong kinds are also harmful, in other words, fats can have bad effects on human's bodies.