Growing up in a family of five (four of us kids plus my mom), my mom used to go grocery shopping about every other day, and she cooked daily. When the wife and I moved in together, she actually introduced me to the concept of the once weekly grocery trip, once-a-week cooking, and eating leftovers. I don't know how she does it, but I know it's a lot easier on everyone not having to go to the grocery store three or four times a week!