So basically fat means unfit, what about the guys I see on boats, thin in shape, but having a smoke between dives, they are a heart attack risk as well. There are many factors that make a person unfit, and if we are talking risk, the older you are the higher risk you may be for a heart attack. So do we say that only people between 20 and 50 are allowed to dive, because heart attack risk goes up at that point. No we don't, I agree that it is the responsibility of the individual to be responsible for themselves in this manner. As for the ability of the crew to handle the overweight person, a person can be a lean, 300lbs solid muscle, they are going to be hard to manage as well. I got a few extra pounds on me that I definitely do not need, and I am aware of that, and I know that puts me at greater risk for various medical stuff, and yes I suppose I might be hard to deal with if unconscious or whatever, but I also play squash 4-5 nights a week, I go to the gym and lift weights pretty much daily, and I get on the treadmill and jog or brisk walk. I also walk to get groceries and run errands instead of drive, at the end of the day its our responsibility.
Sorry don't mean to rant, but I have also seen that look, "oh great this guy is diving with us", and ironically I have been involved in pulling other, seemingly more "in shape" people out of bad situations. I do believe that fitness is very important in this sport, and since moving into the tec world I have focused more on that need, as well I set my computer and plan my dives with a bit of extra conservatism.