why does water go into our system colourless, and come out yellow?
820333
Urine cotains a pigment called urobillinogen which is a product of metabolism of haemoglobin which is released from dead rbcs.
595291
it's good to urinate more, especially if you drink a lot of water or tea and you're unrine comes out a pale yellow or almost clear.  it helps clean out toxins in your body and flush excess fats.
138885
it depends on your body demand for water. generaklly water can be absorbed completely by alimentary system
407640
Urine contains large amounts of urea, an excellent source of nitrogen for plants. As such it is a useful accelerator for compost. Urea is 10,000 times less toxic than ammonia and is a byproduct of deamination (2 NH3 molecules) and cellular respiration's (1 CO2 molecule) products combining together. Other components include various inorganic salts such as sodium chloride (the discharge of sodium through urine is known as "natriuresis".)  The typical clear, yellow, or yellow-orange (usually a sign of dehydration) colour of urine is caused by the pigment urochrome, but also from the degradation products of bilirubin and urobilin.
1039004
The yellow color comes from urea, which is a breakdown product from proteins.  You will always have some - it will just be more or less diluted.  So don't worry about it.\n\nYou DON'T NEED to be drinking "over 8 glasses of water a day" - that's a myth.
952096
Mine is naturally clear. I do, however, drink lots of water daily, which will dilute it. If I cut down on my water intake, I make less trips to the toilet, & my wee is stronger & more concentrated, which makes it a more yellow colour.
1004613
Because they don't eat much besides milk. The yellow is the color of the acid that digests the milk.\n\nonce they start eating, as in eating REAL food, they start having normal colored 'poop" or feces..
1157425
Generally, the darker yellow the more concentrated the urine and you need to drink more liquids to keep the color clear or light yellowcolored. It is better for your kidneys to drink lots of fluids to keep the urine less concentrated.  Some things you eat or drink can also affect the urine color such as asparagus I've heard can turn it green.
768690
I thinks it's mostly used as toilet water.  That's why it's Yellow!.\n\n:-)\n\nOK.  That was a joke.  However, due to the economy of China, a lot of people use the Yellow river for bathing, washing, etc.
846041
thats fine it means ur drinking alot of water and u want ur urin to be white.
411441
You may be slightly dehydrated.  Drinks fluids especially water. Your urine should be pale yellow normally.
560000
maybe yellow jaundice hence yellow
3315
Normally, if you drink something that is not 100% water you wouldnt count it because the ingredients will affect your metabolic system by altering your hydration/dehydration levels.  On top of that you are presurring your kidneys into more work when water just helps them.  Unless its water, dont count it.
1134337
the color of the food is recolored by the bile juice . bile juice absorbs the color pigments in turn produces yellow pigment that colors the material . \n10 points pls .
135430
Well, on a space ship the water in urine actually is recycled, but the waste products are removed first.  No one wants to drink urea (the yellow part), but the water's just water.  It might seem weird to think about, but the water portion of urine is recycled on a global scale too.  When you flush the toilet, it goes to a sewage treatment plant, and then the treated sewage is dumped some where.  Eventually, the water evaporates, and then comes back in the form of rain.  Chances are that every molecule of the water you drink has been through the body of some person or animal somewhere at least once.\n\nAs for recycling feces, it's not practical.  The waste that's excreted is excreted for a reason.  There's little or no valuable nutrients left, and it's teaming with harmful bacteria.  However, like water, the atoms in feces are recycled.  Wherever it ends up, bacteria and fungi will decompose the compounds in feces, and they will end up in the soil.  Some of these atoms in the soil are then absorbed by plants.  So there are probably former feces atoms in the cocoa beans that were used to make your brownies.  Not quite as direct as you were imagining, but on some level it does happen.
374419
8-10 cups per day. However, if you are overweight, exercising, in a hot climate, etc, that number goes up.\n\nA better way to tell if you are properly hydrated is to look at the color of your urine. It should be almost clear. If it is dark yellow, drink more water.
586912
I agree that it could be caused by your prenatal vitamins, if you're using them. The iron and the dyes used in them can affect the color of your urine and feces, both.\n\nMention it to your doctor, just to be on the safe side.\n\nTake care and be well! :)