Don't deliberately pursue the numerical value of heat. Even if you calculate it to 36 digits after the decimal point, it is only theoretical data, which has little practical significance because it can't be accurately controlled in reality. For example, if you eat 1000 calories of rice, it will reach the stomach, and the effectiveness of decomposing and digesting food will be different due to the different degree of food crushing and the different composition and concentration of gastric juice. You can hardly measure and control the effects of men, women and children, spring, summer, autumn and winter, morning, noon and night, hunger, fullness and thinness, and so on on on on the secretion of digestive juice. Suppose that 60% of this 1000 calorie food is processed by the digestive juice of the stomach for intestinal absorption, then how much can your intestinal absorption be? As above, the absorption capacity varies from person to person, and there must be a loss of these 600 calories. Similarly, you still can't measure and control them. Some foods in life are difficult to digest, such as peanuts, leeks, watermelon seeds, and so on. We can often see their strong and tenacious figures when we defecate, so the calorie value of food does not mean that we can really get it after eating it, or we should still eat it ourselves.