Some body fat is needed to keep you warm, support your internal organs, protect your bones, and give you a non-skeletal look. All of this replenishing may show up on the scale, but it is not fat weight. Fat is essential in your diet, and will not make you fat in the amounts that are recommended. You need a minimum of 20 fat grams a day to start. Fat does not cause the abdominal bloating, but does make you feel more satisfied with the food you eat and makes a meal last longer.
Protein is essential for life.
Because there is a little fat in protein, many eating disorder clients also restrict protein unnecessarily. Protein is the building block of your body, and without it your muscles deplete, your organs shrink, your brain is affected, your thermostat is broken, your blood and hormones are weakened. You need a certain amount to survive. Have someone take a picture of you standing next to a friend with an acceptable body shape. This will give you perspective of your body size.