The Dietary Rehabilitation Clinic of Duke University is just one of four diet centers in Durham. Only two of the centers are associated with Duke Hospital. The four centers result in an estimated $25 to $30 million in revenue for the city. This means businesses in the area, including clothing stores, apartment complexes, and malls, are also seeing increased profits from visiting dieters. Celebrities, such as Elizabeth Taylor, and Buddy Hackett, have visited the diet centers.