Fat-free chips made with Olestra
Back in the 1990s, Proctor & Gamble came out with a fat substitute called Olestra (also known as Olean), and for a while, people ate it up in products like WOW potato chips by Frito Lay. It fell out of favor once people started realizing their frequent trips to the bathroom seemed to happen soon after ingesting these fat-free treats.
For a while, the FDA required warning labels on Olestra-containing foods, but not since 2003. Still fully legal in the U.S., Olestra is banned in Canada and all the countries in the European Union.