Yeah, I understand I suppose, looking at it simplistically, I would be at less risk of dying from a heart attack or something. Mineral/vitamin deficiencies can be controlled and supplemented, but excess weight around vital organs can't be fixed apart from losing that weight.

Something else I worry about is whether it's safe or possible for me to lose that amount of weight - I mean, an obese person has a lot of extra strain on the heart, and then doing cardio is even more strain. Is it safer to use the surgery as a kickstart, and then follow it up with a tailored exercise regime, than it would be to jump in and start flogging it right now?