The principle of losing weight:

Weight composition and proportion: water 55%, fat 20%, protein 20%, inorganic salt 5%.

Three major energy substances 1g calories: 1g carbohydrates =4 calories, 1g fat =9 calories, 1g protein =4 calories.

Seven essential elements for human body: carbohydrate, fat, protein, vitamins, trace elements, crude fiber and water.