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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Barium enema
Barium enema: A series of x-rays of the lower intestine. The
x-rays are taken after the patient is given an enema with a white, chalky solution that
contains barium. The barium outlines the intestines on the x-rays.