Yes because you need the energy from the fat from when you are not eating. When you are eating you get the energy from the food while you are chewing it up.
There is no such thing as zero body fat. A certain amount of fats is healthy and necessary. The brain is made mostly of fats.
Protein is necessary to build muscles, cartilage and also enzymes. Carbohydrates provide quick fuel your body needs to function. Fats are a storage of energy. Protein, fats, and carbohydrates all can be used by the body as a fuel but fats provide twice as much energy by weight. Vitamins work with enzymes to perform important metabolic functions. Minerals are important as electrolytes, Iron is necessary in the blood cell's hemoglobin and Calcium is necessary for bone density and strength.
This would be fats. This is why it is so important to include fats in your diet for the proper storage and hormone production in your body.
I'm not sure exactly what the term simple fats refers to but I am guessing you are referring to is the fats the body needs to function. By this I mean the fats included in the structure of cells and many necessary body organs. I may be wrong but at least its a good guess.
Fats ans salt are necessary but only in reasonable amounts.
fat provides warmth and it stores nutrients in case the body needs them.
They release energy after the body digests it and the leftover fats build up.
limit your solid fats
fats
unsaturated fats are fats that are healthy for you and eat up other more less healthy fats in your body
Fats store energy in the body, provide "cushioning" for parts of the body that have a lot of impact, and help provide shape to the body.
fats are used for the resynthesis of ATP, when ATP is broken down, it releases energy. So fats are a fuel for the body.