No matter what colour drink we have, our pee is always the same colour. Where does the colour go?
by 
anonymous
ANSWERS: 3
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The natural color of pee is clear. Pretty much everything else is filtered out by the kidneys. The color of pee is caused by bile, a chemical the liver produces to break up fat. When our bodies break down bile, the pigment urochrome turns pee yellow. The lighter the color, the more liquid has watered it down. In fact, you can easily determine if you're dehydrated from the color of your urine. Dark yellow is a symptom of moderate dehydration and is a sign that you should drink fluids right away. However, taking vitamin supplements can also cause pee to appear yellow. http://ask.yahoo.com/20050902.html
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There are some things that make urine change color but I believe the majority of food coloring ends up in our feces. For example, some people who drank large quantities of Mountain Dew Pitch Black reported green Dew doo. http://www.poopreport.com/Dew/index.html
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If you think that, you're in for a scare the first time you have a nice big helping of boiled beets--you'll think it's blood. But to answer the question of where does the color go--the dyes and pigments in food are digested, just like everything else, and lose their original properties including color. The yellow color is characteristic of uric acid, which is what the body turns highly poisonous ammonia, a product of protein digestion, into. (Bile pigments, from the breakdown of hemoglobin when red blood cells die of old age after 120 days, are what colors our solid wastes.)
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