It is so rude, and none of their business at all... You're not hurting anyone, just giving your baby a better chance at a great start in life! Who could begrudge you that? People would have something to say if you smoked or drank, both of which are not recommended in pregnancy, just like some foods aren't. I'm sure most, if not all of us would applaud you for your decision sorry you're having to deal with people like that during such an exciting and personal journey!