What is this movie I'm looking for????

[Poppet626]

I am looking for a movie I watched years back and can't think of the name, cast etc and when I type descriptions into Google nothing is coming up!!

It's about a girl who's really into fitness but her mum is quite unhealthy diet wise and feeds her little brother and unhealthy diet as-well which causes tension between the girl and her mum etc and also makes her never want to be like that.. I think in the end her mum has a heart attack which is a wake up call for her she doesn't die..

I remember the mum also giving the son pizza Fridays or something!!

Ugh sorry for the bad description lol but can anyone help
Me with what this movie is???