Overeat \O`ver*eat"\, v. t. & i. 1. To gnaw all over, or on all sides. [Obs.] --Shak.
2. To eat to excess; -- sometimes with a reflexive; as, she overate at the party and spent the next week dieting. [1913 Webster +PJC]
They overeat and put on the human equivalent of 50 extra pounds in a few weeks," Rowland said. "We then administer the drug to the rats through surgically implanted capsules.