Eating too much protein can make you fat. Protein, as one of the three major nutrients, is the foundation of life and also one of the sources of calories for human beings. Each gram of protein releases four major calories, each gram of carbohydrate is also four major calories, and each gram of fat is nine major calories, so it is clear that protein is not low in calories. The amount of protein needed each day varies for different groups of people, but for a healthy adult, you need 0.8-1.0 grams of protein per kilogram of body weight per day, which means that a healthy adult of about 60 kilograms will need about 50 grams of protein per day. Protein, if consumed in excess, will be converted into fat in the body, thus causing a person to gain weight. Therefore, any nutritious substance needs to be properly consumed and should not be over-consumed.