How do you tell a girl to lose weight

I've been dating a girl for a couple of months and she's put on some pounds. I tried to bring it to her attention by giving her the nickname tum-tum and grabbing her flab frequently. however that seemed to only make her angry and want to eat more. help please
Updates
+1 y
lol jeez, y'all are angry. we broke up because she found some texts on my phone.
Updates
+1 y
also it wasn't just a few pounds she went from like 110 to 125 yuck!
Updates
+1 y
by the way this question was a joke lol
How do you tell a girl to lose weight
Post Opinion