In the past, calories obtained by burning food vs. calories obtained by burning excrement from eating food in the same amount
We're going to measure the difference between these two, and we're going to think of these as the calories in the food
I used a method of calculating the absorption rate when digesting this food.
Now it turns out that calories per gram are protein, carbohydrates are 4 calories, and fat is 9 calories
Calculate the content of these three nutrients in food by multiplying calories per gram.
In the late 19th century, American chemist Wilbur Olly Atwater began studying the amount of energy humans get from eating. To analyze the proportion of energy used in the human body, he strictly controlled the subjects' food intake and calculated the energy loss from the excreted urine.
As a result, it was found that about 10% of the food consumed passes through the body undigested, and considering such losses, protein, fat, and carbohydrates provide 4 4, 9의, and 4㎈ of energy per gram, respectively. It was also found that alcohol contained 7가 per gram.
Based on that fact, Atwater calculated the calories contained in about 1,000 foods, leading to the calorie counting method used today.
Source: http://www.sciencetimes.co.kr/?news=%EB%AA%85%EC%A...
The way you calculate the calories in a dish is a little complicated, but first you calculate the content of each of the three major nutrients in the dish.
Then, multiply this by calories per gram (4 kcal for protein, 9 kcal for carbohydrates, and 9 kcal for fat) to add all the numbers.
Recently, a device that measures calories in food by shooting ultraviolet rays has also been developed.
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