Before you go grocery shopping, plan ahead. Make a dinner menu for each night of the week. Then do your grocery shopping based on the items on your menu. If none of my dinner choices include potatoes, there is no need to even buy this item at the store. Only buy items you will need to complete your menu.
If you plan on making spaghetti one night, you should only have to buy noodles, sauce, and garlic bread (optional) for that dinner option. Don't buy "extra" food that is not on your menu, unless it's on sale and you plan to freeze it.
