The difference between kcal and cal is 1000 cal = 1 kcal.
However, we usually count food calories with kcal, and use kcal and cal
interchangeably. Therefore, 9 kcal [Food Calories] = 9 cal.
So, to the point: If there are 9 kcal in 1 g of fat, there are 9000 kcal in
1 kg of fat (1 kg = 1000 g).
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