So there is a woman I work with who is significantly obese - don't want to guess numbers, but definitely noticeably carrying around a lot of excess weight. Let's call her 'Callie.' She's an outgoing, cheery person and generally gets along with other people at work for the most part. We have a few people on staff (myself included) who probably have a BMI of over 30 and are carrying around some extra pounds but not as significant as Callie.
I've heard several comments from colleagues and our boss re Callie's size. The other day a colleague of mine said "Clearly, as you can see, she has problems with self-control..." relating about another situation Callie was in. Or another time a different coworker said, "Well, obviously, for Callie, food is love, so..." and went on to make a point. These are just two examples and there are other times similar comments have been made.
So far when these things have been said I just don't respond to that part of the comment and try to shift the conversation, but it kind of bothers me. First of all, because I wonder if people have said (or still say) things like this about me. Secondly, because we don't really know Callie's situation. She's a mom of a baby under the age of one, and hello, aren't most new moms carrying around extra weight within the first 12 months of giving birth? Or who knows maybe she has some medical issue (like I do) which makes weight loss more challenging. It's not appropriate to make a comment about someone who struggles with depression or some other mental health issue, and it's not appropriate to comment about someone with some kind of physical disability in a work setting, so why is it okay to comment about Callie's obesity and basically imply it is a sign of a weak character? Don't get me wrong - Callie definitely is at an unhealthy weight, and I'm not supporting any bad decisions she is making re her lifestyle choices, but I just don't like it when my colleagues feel they have the right to make comments like this.
Am I being oversensitive? Should I just let this slide? Has anyone experienced something similar? Thoughts?

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And I don't always have the guts I wish I had, but sometimes I surprise myself
It's one of the ways in which age *is* kind.