Fat or overweight people know they are fat but just don't appreciate how fat they are. Three months ago I took a short trip in Y SYD-ADL with my 19 and 18 year olds, and it wasn't until they showed me how much I encroached on their seating space that I actually realised how fat I was. I am 175cm and was just a touch over 120kg, blood pressure was through the roof etc etc. I actually started with LiteNeasy food and I now weigh 102kg, meaning I lost 18kg in just over 2 months. I am still considered obese by BMI standards, but my main point is fat people just don't appreciate how unconfortable they make it for fellow pax. Some people don't care, but others may have a more serious problem and have more problems correcting it.
We all know the only cause of obeseness is the amount food you eat, and everyone can do something about that. I am not having a shot at fat people because I am one, but I am doing something about it. It is apparent that some posters here are overweight, but because they pay for their ticket they don't seem to care about the person sitting next to them. Remember, the person sitting next to you has paid the same money so why should they be unconfortable when they travel. You would be aware of any problem in this regard before you buy a ticket, so travel in a larger seat (J) or buy a comfort seat, and again this is not for your comfort but the pax next to you. Don't shoot me down in flames too much, everyone is entitled to their opinion and that is what this forum is about.