If one gram of fat contains 9 calories, and there are about 454 grams in a pound, how come 1 pound of fat is commonly equated to be about 3,500 calories instead of about 4,000 calories?

Question

If one gram of fat contains 9 calories, and there are about 454 grams in a pound, how come 1 pound of fat is commonly equated to be about 3,500 calories instead of about 4,000 calories?

In: 10

Answer 1

I’m pretty sure that these are different definitions of fat. Because 1kg of lard contains 8977 kcals, which when rounded to the closest number comes to 9 kcal per gram. Ie, a purified fat product that contains exclusively fatty acids (ie, pure fat)

However, when we’re talking about “3500 calories per pound” we’re generally talking about bodyfat. Fat tissue. And that’s not pure fat but instead a clump of fat cells that consist of mostly fat.