Yeah, this whole comment just seems really defensive and dismissive . She has type 1 diabetes, which already increases her risk for mental health issues. I understand you “strongly believe it’s gotten worse because she’s obese”, but there is a lot of research to support the the opposite is just as often true (childhood depression, anxiety, and ADHD is linked to obesity later in life). If obesity were an easy thing, we wouldn’t have an obesity epidemic. Why trivialize it? I think you are a good sibling. You are doing the best you can. I said it before and I’ll say it again, take care of yourself first.