You would have had to establish a baseline before you started by measuring your body fat percentage, calculating how many pounds that is as a percentage of your total bodyweight, and then subtracting that number from your total bodyweight to get your "lean mass". Of course some of that lean mass number will be bone, other tissue, and water but that any increases over that number will either be fat or muscle (maybe a little water here and there depending on the individual). Then you'd just check you bodyfat percentage again at some later point in time.

However, unless you have a significant amount of bodyfat the mirror should give you plenty of info.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.