Which major food brand originally started as a health-focused product at a sanitarium before becoming a mainstream breakfast staple through innovative marketing?

Many iconic food brands have fascinating histories that shaped their identity and success. This trivia question explores the surprising origin of a major food brand that completely transformed its marketing strategy and product positioning. Test your knowledge of food brand history and how pivotal moments in a company's past can reshape its entire future in the market. Can you identify which well-known food brand underwent this remarkable transformation?

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Kellogg's Corn Flakes
Heinz Ketchup
Coca-Cola
Hershey's Chocolate