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Obese people become as addicted to food in the same way that junkies do to their drugs, according to a new study, which may explain their constant cravings. Evidence that the obese are food "junkies" comes from brain scans of seven obese people who were fitted with electrical devices designed to fool them into thinking they are full by making their stomachs stretch. The implanted devices, known as "gastric stimulators", provide low-level electrical stimulation of the vagus nerve, which runs from the stomach to the brain. When the device is switched on, the vagus nerve stimulation causes the stomach to expand and produce peptides that send a message of "fullness" to the brain.