To orbit is to follow a circular or elliptical path around a central body. Usually a planet, moon or satellite is described as orbiting, but a child who has too much sugar can sometimes orbit around his parents in an annoying fashion.
The FDA was empowered by the United States Congress to enforce the Federal Food, Drug, and Cosmetic Act, which serves as the primary focus for the Agency; the FDA also enforces other laws, notably Section 361 of the Public Health Service Act and associated regulations, many of which are not directly related to food or drugs.
Today, the U.S. government has an alphabet agency for just about everything. The nanny state feels like it has to watch, track and tightly control virtually everything that we do. The Federal Register is the main source of regulations for U.S. government agencies. In 1936, the number of pages in the Federal Register was about 2,600. Today, the Federal Register is over 80,000 pages long.