Q&C| How do scientists know the calories in each food?

Shows calories in food for energy content, and thus play a major role in nutrition science, say scientists, The number of calories needed by your body daily, 2,000 kcal on average, whereas a man needs a day to 2500 kcal on average.

Scientists say the need to reduce the number of daily calories in the food if we want to get rid of excess weight, it burns calories depending on the daily body, while storing the excess ones in the image of glycogen or fat in liver, muscle and fat cells. But how do the customers estimate the calories in what kind of food?

He began thinking of the scientists in knowing the calories in food in the late nineteenth century, where they began their mission hard to burn food in a closed container and measuring the heat generated, has discovered through their studies that one gram of fat contains 9 calories, which is twice what there is in protein or carbs.

By the beginning of the twentieth century, a research team, at Wesleyan University in Middletown, Connecticut, America, to the system of our Atwater System, relative to the American chemist Wilbur olin out (1844-1907), which can calculate calories in food without the knowledge tests, depending on the ratio of fat, protein and carbohydrates that it contains.

Despite the speed and low cost of the system out, there is a growing concern of its accuracy, especially it does not take into account his how to use the body for calories.

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