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This is interesting. In some diets (I am thinking Indian? Maybe?) color is just as important as nutrition.

In this theory, we are attracted to the thing, in this case color, that we could use more of.

I did a quick search of color symbolism and this is what I found:

Red

Excitement, energy, passion, love, desire, speed, strength, power, heat, aggression, danger, fire, blood, war, violence, all things intense and passionate.

Maybe you should look up color therapy and/or color healing to investigate yourself.

http://www.beliefnet.com/Health/2009/02/Healing-Ch...