Have you ever had people comment / complain about how much you eat or even DON'T eat?

Rick’s cousin had a BBQ yesterday. I was hungry and I filled my plate, but only ate about half of what was on my plate because that’s all I can eat at one setting.
Apparently the hosts were concerned that I didn’t like the food because I didn’t eat much. Now Rick feels the need to explain to them that I had stomach surgery 2 months ago so my eating is off, which is conveniently true, but my eating habits aren’t actually much different than they’ve always been.
This is not a new thing for me, either. Why do people feel compelled to comment on this??