Which popular food product was originally developed as a medical remedy before becoming a breakfast staple?

Test your knowledge about the fascinating history of food product development! Many of today's most popular food items were created through unexpected innovations, failed experiments, or happy accidents. This trivia question explores one famous product's surprising origin story. Can you identify which beloved food item came about in a way that defies common belief?

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Kellogg's Corn Flakes (developed as an anti-masturbation food for patients at the Battle Creek Sanitarium)
Heinz Ketchup (created as a digestive medicine for stomach ailments)
Coca-Cola (formulated as a headache and morphine addiction treatment)
Nutella (invented as a protein supplement during post-WWII chocolate shortages)