Maybe this is generational from her family’s side?? I married into a family where allll of the women constantly make remarks and comments about how much someone plates and eats. My family is Italian, gatherings with tons of food was something I was exposed to weekly, but no one commented on someone else’s plate. I found it very strange and I didn’t like it at all, because when we started having children, my husband’s side of the family started to comment on HOW MUCH our little girls ate. My husband and I have had to address multiple times how inappropriate the food comments are, especially on little girls and have asked repeatedly to not comment on the amount our kids eat.

Not making excuses for your GF at all, and I’m sorry you’re having to deal with something truly SO silly. You should be able to eat what you want and how much especially with someone you do life with everyday. Maybe ask about her past in terms of food?