With the introduction of the first "Walmart Supercenter" way back in 1988, those giant superstores that sell groceries in addition to everything else on the planet, Walmart forever changed the way Americans buy food. In just 30 years, Americans transitioned from visiting produce and farm stands, independent retailers, or even the supermarket for their grocery needs, to shopping for food at Walmart. In fact, grocery sales now account for over half of Walmart's total annual sales, totaling $200 billion each year. Factor in sales from Sam's Club, Walmart's warehouse club sister store, and that makes the company the largest retailer of groceries in the country.

While the low "rollback" prices and product exclusives sometimes make it tempting to get your Swiffer refills, picture hanging kits, pressboard furniture, tube socks, printer cartridges, paper towels, firearms, and fresh cantaloupe all in one place, not every item that lines the grocery section of your local Walmart is worth the trip. Here, we take a closer look at the 12 foods you should never buy at Walmart.