<human>: My mom got bariatric surgery several years ago and has lost a ton of weight. However, in the past couple years she's began to gain it back. She snacks constantly, started smoking again, and drinks a lot of wine. When she got married last year, she even had to buy a bigger dress after a few months. 

We both got FitBits to motivate each other, and I got her a healthy snack subscription, but every time I see she's gained more weight. I see her every few months and it's noticeable each time. 

When I was growing up she was always very concerned about both her and my weight and I know she felt bad about it. She's very sensitive about people attacking her so I'm at a loss at how to approach the subject.

Can you provide a brief overview of the text?
<bot>: After getting bariatric sugery, my mom is gaining all her weight back. She's a very sensitive person, so how can I bring it up without upsetting her?