A robot coach is the latest attempt to address a growing epidemic of obesity. Inventor Cory Kidd combines psychology and robotics in the device, which addresses users in a soothing voice and tailors its diet message according to a person's day-to-day needs. And as for people who access diet advice on a screen, studies show that users "remain engaged longer with the robot and find the information presented more informative and credible," Kidd said.

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