This has happened to me three times in the past week now, from three separate people I know on a personal level, and it's sort of messing me up. I hate that this is seen as acceptable by some people, to just reach out and comment on something that DOESN'T AFFECT THEM PERSONALLY IN ANY WAY.
All of these instances I was really too shocked to even respond. Yesterday, I noticed myself agonizing over what I was eating, saying "I should go back on low carb, I should lose 20lbs. I look better in a size 4. That's why people are saying things. My legs are disproportionate. Blah blah blah." Thankfully I caught myself before the day was over and reminded myself to show a little more self-care and compassion. But still. What the actual hell?
ETA: This isn't an okay thing at any size. Concern trolling isn't okay. Fat shaming isn't okay. Thin shaming isn't okay. Other people's bodies aren't anyone's business but their own. Just needed to tack that on. I'm good at viewing others with a decent amount of care and grace, I've got some work to do in extending that to myself, and not taking on shitty shit that others project onto me.