OK, if you want to be pedantic:
"deliberately large as a result of <insert food items/sporting activity of your choice here>" - be that Creatin/Pies/Chocolate/whatever.
Better?
At over 18st I definitely took up more than one train seat. I couldn't play 5-a-side to start with, I had to start with just walking, which I did for 6 months until I was down to about 14st (most dramatic loss occurs early on), then I started playing 10 mins of 5-a-side a day to shed the other 3 stone.
The morbidly obese who cannot move, possibly should not be flying - if you are too fat to walk then you have far more worrying concerns than being charged for two seats on an airplane...you should consider some sort of surgery stomach-bypass effort, imo.
She managed to get to the airport, she could walk [it doesn't mention she's wheelchair bound], therefore she CAN exercise, she CAN eat less calories, she CAN get thinner. The End.
Its quite clear you only care about 'winning' this rather than having an actual discussion...What is this 'the end' rubbish..
As someone who was previously obese, i would have thought you would welcome discussion on the issue..I guess not.