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The one all the way on the right is what used to be stock corn, meaning we gave it to stock animals or ground it into flower. It's not for human consumption the way it's eaten now. Actual maize is quite colorful and was modified for easier human consumption. Ever wonder why corn shits out whole? It's because America gave you our stock corn instead human corn. Congratulations America, I you played yourself.
You can see corn in your poop because the outside of the corn kernal is made of cellulose, a.k.a. dietary fiber, that stuff that's good for you because it isn't digested and you poop it out. Meanwhile the nutritious inside of the corn kernal has been easily digested by your body as normal.
The corn in your doody is not the nutritional content, it's the nutritional content's used empty packaging which helps clean the pathways on its way out.