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The procedure involves placing an implant, around the top part of the stomach, effectively dividing it into two. A person eats enough food only to fill the top part of the stomach, according to Columbia University Department of Surgery. “The band has fewer short-term complications because it is less invasive, but it is less effective and revisions are commonly needed,” Dr. Yancy says. The band can slip out of position. Weight regain can occur if that happens, he adds. “[That’s why] this procedure is falling out of favor.”