Almost 40 million U.S. adults are obese, according to the Centers for Disease Control, and this year some 70,000 of them will go under the knife to have their stomachs bypassed or stapled in painful and expensive procedures that prevent overeating. But if human trials now under way in the United States pan out, overweight people may one day have a less invasive surgical option: a device that helps people feel full by stimulating the stomach with electricity in much the same way a pacemaker stimulates the heart.

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