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I know that marigold oil will yellow a white bird, and though it hasn't been proven I believe corn does the same thing... which is why my birds dont get scratch grains, or anything with marigold oil.
However I have heard that corn does keep them extra hot in the summer.
I can't be specific about the way it does it, but if its like other animals, corn is a starch. Starches turn to carbs, and carbs turn to sugar, which "hypes" them up. The extra energy their body produces is exerted in heat.
At least thats how I think it works. I'm not a vetrinarian and cannot be for certain, so take my explanation with a grain of salt, and feel free to research it further.