I'll say this, I can definitely sympathize with the temptation of eating shit you don't have to when you don't live alone. The majority of my running/lifting days in the past were when I lived alone and it's easy to cut/bulk by only having exactly what you need in the house. But once I got married sometimes I'd almost feel obligated to eat something my wife bought or cooked. She understands now because I told her hey, I can only eat this, this and this, please don't make this, make that instead. Maybe you should tell your mom that you'd like her to help you out with your diet by not buying shit like that or at the very least not encouraging you to eat it.