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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Cystinuria should be suspected in people younger than 30 years who have kidney stones. The kidney stones caused by cystinuria are yellow-brown in color and 6-sided. Diagnosis is confirmed by finding large amounts of cystine in the urine.