Seldom have I seen someone miss the point THIS hard. Reading an essay by someone who feels bad that people are losing weight at her. She's feels good when someone fails to lose weight through diet, and gets especially mad at weight loss surgery because it works.
She went with her mother to support groups, not to support her mother, but for the free clothing. She feels morally superior at the end because she didn't try to ruin someone's post-surgery recovery.
The author near the end aaaaaalmost grasps that apart from vanity there might be other reasons for losing weight, but then immediately considers only the most superficial aspects. Maybe it's what others say about her?
For one brief moment she does actually realize that maybe people have their own reasons for wanting to lose weight. Diabetes, ruined knees. Those she accepts, but wanting to prevent it is not allowed, making that private choice is too much of an insult to the author.