Conditions and illnesses are treatable (mostly). You are choosing not to seek help with that. I know that in my NHS trust programmes are run with group discussion, and gentle exercise sessions in the park. Referrals are made by GPs. Additionally, subsidised gym places are given. The take up is very low
If you had a broken leg you wouldn't stay at home and not seek help. It's the same here. You have made a decision not to deal with it
Being overweight to the extent that you can't fit into a theatre or airplane seat must be compromising your experience. And still you don't seek help
Seriously?
If you have a broken leg, you go to A and E and get treated within hours.
If you have a mild to moderately severe eating disorder, especially an over eating one, you go on a waiting list for 6 months to 2 years then you get one round of CBT which may or may not work.
Even if you get treatment and it's successful, the average recovery time for an eating disorder is 5-7 years. Are people supposed to lock themselves away from society for that time in case they offend someone with their fatness? (I know this isn't what the OP was saying - she was looking for solutions and advice - but this is the kind of attitude that seems to be coming out of the thread now).