Thats one of those comments you *think* about other people but not dare say. I haven't had that comment but my face probably isn't as pretty as yours.
I read something here yesterday that could handle this situation well. If you want to address it just say, "I think I am pretty now but I would like to be a healthier weight.." In all honesty I must also share with you that a real man, the kind of guy you want to attract, will care LESS about your weight and MORE about you!
In the area I live in, I have seen plenty of women come and go with certain men. I don't want the kind of guy that tosses me anytime I am not "looking" up to snuff. After all, if he thinks my weight is bad than what will happen if I should be diagnosed with breast cancer or be crippled in an accident? How will he handle it when our child faces struggles? Nope, don't want a fair weather guy!