2. The main ingredients of fish head tofu soup are fish head, tofu and vegetable oil. Generally, the calorie of fish head is 97 kcal/100g, tofu is 80 kcal/100g, and vegetable oil is about 900 kcal/100g. Suppose a pot of soup is added with 500g fish head, 500g bean curd, 50g vegetable oil and 2000ml water, and the heat of this pot of soup of about 3000mg is 1335 kcal, that is, 44.5 kcal/100g.