To be fair, in the CICO model, everyone on Earth would lose the exact same amount of weight, regardless of any of the factors you mention - or at least, the weight loss we'd experience from truly following the tenets of CICO could easily offset any individual mass modification from food or exercise!

It's also true that you'd get far more, and quicker, weight loss by increasing your distance from the earth instead of reducing the earth's mass, but that seems a little selfish...