Proteins, carbohydrates, and fats have distinct energy values per gram. The Atwater system aids in calculating caloric content on food labels, adjusting for factors like fiber content. Food calories represent energy stored in food for human use.
Calories: Proteins and carbohydrates provide 4 kcal/g, while fats offer 9 kcal/g. To calculate the total kilocalories in a food item, multiply the grams of each component by their respective energy values.
Atwater System: The caloric content on food labels is determined using the Atwater system, which considers the average energy values of protein, carbohydrate, and fats. Fiber content in carbohydrates is adjusted for, as it's indigestible.
Energy Storage: Food calories represent energy stored in food. This energy is extracted by humans for various activities. Understanding caloric content helps in assessing the energy intake from different food sources.
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