The human beer belly is essentially a large secondary bladder of toroidal shape, which wraps about the smaller of the two intestines. Its primary function is to store excess beer if and when the beer drinker's internal digestive system reaches full beer-carrying capacity (a painful condition which can be relieved only by endless hours of excruciating exercises, or a quick whiz). An overflow viaduct, access to which is controlled by a set of beer-sensitive valves, leads from the lower part of the esophagus and direct to the male beer repository, bypassing the kidney and both livers entirely.