American coffee = black coffee with about 20 calories and nothing added. The heat is quite low. Diluted with water, it becomes ordinary American coffee. A cup of coffee is only about 20 calories, which can be said to be a natural low-calorie coffee. Mocha pot coffee = about 1 17 calories. Generally, Italian coffee is brewed in mocha pots invented in Italy. This coffee pot also uses the principle of steam pressure to extract coffee.

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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.

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.