I can barely afford groceries for my family. How can i afford to eat right to lose weight?

We are a one income family. I help somewhat by taking some cleaning jobs on the side. We cant get istance (WIC, foodstamps, or welfare) because my husband makes too much money and we own our own home and we r saving for our future and for the kids future. We cut back on the savings somewhat too help ease the shortage of money. We are still having a hard time affording groceries. It seems like all we can afford is the junk. i definitely can stand to lose weight and my children are picking up the bad habits. How can we afford too eat better when its so expensive to buy healthy food? I dont want to die the way my mother did. She had type 2 diabetes, gout, congestive heart failure, and her body was running on 1/4 of a kidney. Please help. I guess if you need to be cruel, i can take it. I'm at my whits end and am getting very frustrated.