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.
Read more health news
A cleansing enema is recommended either the night before or the morning of the test. During an enema, liquid is injected into the rectum through the anus. This cleans the bowels in preparation for the test.