Which breakfast cereal brand first introduced a 'whole grain guarantee' across its entire product line in response to changing consumer health trends?

The breakfast cereal market has been a battleground for major food companies for over a century. Behind the colorful boxes and cartoon mascots lies a fascinating world of marketing psychology, brand evolution, and strategic product development. This trivia question explores how one major cereal brand adapted its marketing strategy to changing consumer health trends in the 21st century.

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General Mills
Kellogg's
Post Consumer Brands
Quaker