People who comment on the eating habits of others drive me up the freaking wall.
Like, it’s okay if you’re good friends with the someone and you’re both okay with the comments, but if you’re acquaintances/friends that aren’t too close/strangers, then it’s like…seriously?
Who even cares, anyway? What business is it of yours? So Person X eats more than you/less than you/rarely/frequently/constantly/late at night/only on odd days of the month/food you’d never touch with a 10-foot pole? Unless you’re legitimately concerned about their health (and even then it can be iffy), don’t comment on it. Because it doesn’t concern you.
Also, some people just don’t like talking about that kind of stuff, so if someone says to them, “why do you [some obnoxious comment about food habits]?” it might make them feel super awkward or embarrassed.
So shut up.