Planning your menus on a weekly or monthly basis can reduce the number of trips you take to buy groceries -- reducing the number of times you can be tempted into impulse purchases. Planning a menu will prevent quick trips to the grocery store for items you forgot. It allows you take advantage of bulk buying as well by planning all the menus that use an unusual ingredient the same week. Another option is to plan your menu around sales listed in the store flyer and save money on meat and produce that way. Stick to your list when you go shopping. If you hate planning consider subscribing to a menu planning service, which will plan the menu for you. Some services will plan based on weekly sales, while others focus on groceries costing a certain amount each week.