Since there seems to be nowhere on this Backpacking LIGHT website (other than chaff) to discuss the issues around being overweight to ULTRALITE hiking, and suggesting that someone might want to, and benefit from, losing fat on such a site might be considered either offensive or trolling, and to bring the subject up in a GEAR forum in particular is offensive to some (understandably), I would like to rephrase my original question as such:
Facts: Tall people will need to carry more weight in gear than short people of the same build, all other things being equal. People who sleep cold will need to carry more insulation than warm sleepers, other things being equal. Side sleepers may need to carry more weight than back sleepers, all other things being equal, etc…
SO, what is the weight penalty, in terms of GEAR, of being overweight?? The conditions mentioned above are rarely within our control, but body weight (especially body fat) is to a varying degree well within our control if we make it as much of a priority as lightening the rest of our gear. For instance, if I grow from a size medium to a size large due to an increase in girth, how much extra weight in gear will I end up carrying, all other things being equal?
A real life example where I can put hard numbers is when I ended up selling my beloved WM Ultralite and getting a WM Versalite instead. This was merely to accomodate my increase in girth. Ultralite=1 lb 13 oz; Versalite=2 lb. So 3oz difference.
What I don't know, and would like feedback from anyone who has gone up or down a size and has weight differences between two otherwise identical pieces of gear, is what is the weight penalty for everything else? I'm thinking base layer + windshirt + rain gear + insulation layers + bigger pot for bigger meals + more fuel for bigger meals +???? This is aside from any decrease in total skin-out weight that might be considered since that is apparently a different topic.
I AM NOT TROLLING, and I am not selling anything, and I mean no offence to anyone. But I really am curious to know what cross section of people who visit the GEAR forum have considered, or are actively trying to reduce, their total SKIN-OUT weight by reducing the size of gear they need to carry (especially garments, cooking and sleeping systems).

