In fact, the two are not contradictory. 1 kg pure fat can provide 9000 calories for the body, but when we consume 7700 calories, the body's adipose tissue has decreased by one kilogram.
This is because the fat in our body itself contains bound water, and the adipose tissue of 1 kg can be completely consumed as long as the body consumes 7700 kcal more.
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Considering the daily calorie intake and daily consumption of the body. According to the viewpoint of modern nutrition, only by creating an energy gap can we lose body fat.
Generally speaking, it is the daily intake of calories MINUS the daily consumption (generally about 1500 calories, which varies from person to person), and then MINUS the calories consumed by our exercise. If we can accumulate 7700 kilocalories, our body will lose one kilogram of fat.
Correlation extension
What is heat?
1. What is heat? The human body consumes energy all the time, and energy is provided by thermogenic nutrients in food. Nutrients that can produce calories in food are protein, fat, sugar and carbohydrate. They are oxidized to generate heat for the body to maintain life, grow and develop and exercise. When there is too much heat supply, the excess heat will be stored as fat. After a long time, the body will get fat.
2. Unit of calories: In nutrition, "kilocalories" is used as the unit of calories. 1 kcal is the heat required for1000g of water to rise from 15℃ to 1℃.
There are three main ways to consume heat. The first part is basal metabolic rate, which accounts for about 65-70% of the total calorie consumption of human body. The second part is physical activity, which accounts for about 15-30% of the total calorie consumption. The third part is the thermal effect of food, which accounts for at least about 10%. The proportion of these three parts has been basically fixed.
Calorific unit: calories, 1 calories = 1000 calories.
Nutrients that can provide calories in the diet are sugar (carbohydrate), fat, protein, alcohol, organic acids and so on. The calories they contain are: sugar (carbohydrate) 4 calories, fat 9 calories, protein 4 calories, alcohol 7 calories and organic acid 2.4 calories.
To calculate the calories contained in food or diet, we must first know the weight of calorie nutrients, and then use the following formula to calculate:
Calories (kilocalories) = grams of sugar ×4+ grams of protein ×4+ grams of fat ×9+ grams of alcohol × 7.
The heat consumed by adults is utilized in three aspects: basic metabolism, activity and food thermal effect; During growth and pregnancy, the tissue structure needs extra heat.