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I'll quote something I found by googling red hungry:

A variety of colors can trigger hunger. The most influential colors in terms of food are: red, orange, yellow. [...]

A color psychologist would tell you that this is no surprise: red is the color that makes people hungry. Red instantly attracts attention and it also makes people excited, energetic, and increases the heart rate.

I've heard this a lot, but I have never noticed it working on myself. If it does work, it would have to be a subconscious procedure. Has anyone ever verified this?

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Why on earth would you Google red hungry, of all things? –  user4882 Oct 26 '11 at 23:46
No wonder I get the urge to snack while sitting at traffic lights... –  Flimzy Oct 27 '11 at 2:12
I do not quite understand what u are trying to ask, are u looking for sources, or whether the claim that red triggers hunger is true and authentic or what? –  ApprenticeHacker Oct 28 '11 at 11:58
I'm asking whether the claim is true; naturally sources would help :) –  Daniel Oct 28 '11 at 16:56

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