A Japanese inventor is credited with the idea of a vision diet. The vision diet requires eaters to wear blue lens glasses so that their food appears a blue color, which apparently is unappetizing. It is based on the principle that foods in the red/yellow spectrum look the most appetizing, and thus should be disguised so that you won't find them appealing. This may be a main reason that some fast food chains use these colors in their logos.
source: www.denverweightlossclinic.com
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