How can the composition of urine provide clues about problems in other human body systems?

The urine may have abnormal chemicals and substances in it, which can show that another body system is working improperly. The Urine contains substances that the body expels into the excrement. It is the left proteins and things that the body does not need or does not require. Urine can hold clues to drug usages, foods and drinks that were ingested and even some body traumas. 

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