What is meaningful is the amount of belt I could be using. It looks like about 6 inches (a little more than 15 cm) of loss on my waist in the past year or so.
MAS, has a post about his skepticism of Body Mass Index. Hugh Jackman and Mike Tyson at his peak would measure as “Obese” according to the BMI, basically. In that post he cites The Frankie Method for measuring leanness. Frankie was a trainer at a former gym of MAS, and his measure was: “Can you see your abs? If no, then you are too fat.” My answer to that is still no, but I can see the outlines of where they will be.
I made a diagram: