Thank you to all who have shared so eloquently and personally here.
Alexandra, the thing is, the question "why don't they do XYZ" can sound judgemental of the obese person for NOT treating what another thinks is the underlying cause of their size. Though I'm not sure how one treats genetics (as in bone structure, proportion, height, breast development, ability to develop muscle, etc.). We just don't all have an inner Kate Middleton hiding inside. I'm a tall, galumphing, eastern European peasant. It ain't gonna happen.
In any case, as others have pointed out, one can be "plus sized" without being obese.
Myself? I acheived size 10-12 earlier this year (145 at 5'9") after many wasted decades of self doubt and torture and yo-yoing. How? Leukemia and thyroid cancer. My doctors did not encourage me to remain at this fashionable weight. Fortunately, I have gained some weight and they are happy, and so am I.
This very worthwhile conversation reminds me of two things:
1. Some teen magazine from my youth, in the early 70's, that recommended an ideal weight of 100 lbs for your first 5', and 3 lbs for every inch thereafter. Lol whut as the kids say.
2. A Doonesbury cartoon from the Jane Fonda workout era. It's after hours, the studio is closed, and Jane is in the office with the (black) cleaning lady. Jane tells the woman that she would do well to come in for a workout session. "I'm too busy," says the woman, " with three jobs and public transportation and a family to support...." "So am I," says Jane. "i'm an actress, mother, wife, and I teach classes all day!". "Yes," says the woman, "but you're as busy as you want to be. I'm as busy as I have to be."