My mom keeps buyin sh*i*te from the shop and its ridiculous...read on please?

my mom has always bought loads of cookies and buiscuits and chocolate bars and potato waffles and mini cheesecakes and potato croquets and loads of rubbish but lately its becoming every day she is bringin home junk with the latest new chocolate bar chocoolate bikkies and she only buys bananas for dad coz he loves them but its not enough fruit to be buying...when i asked her this mornng to buy weetabix and porridge at the shop today, she went nuts she was like *in an annoyed tone* ''why do you want me to buy the 2 of them?'' and i stood my ground sayin that i was sick of eating coco pops every mornin for the last few weeks (not very healthy) and she goes dont be a ***** with me.every time i talk to her about how she buys too much junks he gets piss*ed with me and i just cant talk to her bout it.i really dont want to get fat i a a slim normal size but i dont wanna lose my figure.what should i do.. she doesnt eat this stuff by the way and i dont mean to b bi*chin bout her...............