It’s even easier in the metric system, where a 500 kcal (daily) deficit should roughly amount to a 500 g (weekly) weight loss. And AFAIK this is calculated bas

It’s even easier in the metric system, where a 500 kcal (daily) deficit should roughly amount to a 500 g (weekly) weight loss. And AFAIK this is calculated based on body fat actually corresponding to around 7.7 kcal per gram, not 9 (that is for food).