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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Urea
Urea: A substance containing nitrogen that is normally cleared from the blood into the urine by the kidney. Diseases that compromise the function of the kidney often lead to increased blood levels of urea, measured by the blood urea nitrogen (BUN) test.