Daily fat intake should be based on the total daily calorie intake, except for infants, the recommended intake of dietary fat for people over 4 years of age is 20% to 30% of the total energy of the day. The Chinese Nutrition Society suggests that the proportion of total energy provided by fats and oils in the daily diet should be 20% to 30% for children and adolescents over 4 years of age, and the same for the elderly and adults, and generally not more than 30%; The daily intake of cholesterol should be below 300mg. The ideal fatty acid composition is saturated fatty acids: monounsaturated fatty acids: polyunsaturated fatty acids = 1:1:1. Fat in the human diet mainly comes from fat in animal foods, cooking oil and seeds of plant foods; phospholipids are more abundant in animal offal, peanuts, soybeans, etc.; cholesterol mainly comes from animal offal, egg yolks, crab yolks, etc.