Caffeine is a diuretic. It blocks ADH (antidiuretic hormone) and causes you to pee more. ADH helps the kidney to reabsorb water before passing into the bladder. So by blocking ADH caffeine causes more water to be expelled. By peeing more often it causes dehydration which could cause the darker color of your urine.
Thank you Zoology 100 hah
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Thanks for the killer game of Crisco Twister
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