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It is a calorie from fat. Calories come from one of three sources: proteins, carbohydrates or fat. So a fat calorie would be a calorie coming from fat, not protein or carbohydrates. It's not really special in terms of what effect it has on the body, but it should be noted that fats are more calorically dense than protein or carbohydrates. One gram of fat has 9 calories, while carbohydrates and protein only have 4 calories per gram.

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18y ago

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