Joe Giblin/AP Photos The grocery store can really eat up a budget — the monthly median spending on food for American families is roughly $520. But anyone can cut up to 50% off their grocery bill, according to Coupons.com's Jeanette Pavini. The key to grocery shopping the right way lies in joining your grocery store's loyalty program and being strategic to maximize your member's savings benefits. Grocery shopping is known to eat away at our budgets.