Yes you're basically right, but it is (perhaps unfortunately) a common way to express it in English. I.e. 2x fewer calories would imply 1/2 as many calories, 5x

Yes you're basically right, but it is (perhaps unfortunately) a common way to express it in English. I.e. 2x fewer calories would imply 1/2 as many calories, 5x faster would imply 1/5th the time, etc.