Thank you, science. Steve Mirsky reported in Scientific American that thinking makes you eat more. He cited a study in Psychosomatic Medicine that compared people doing three different things: sit and relax, participate in memory and attention tests, and summarize a text they had just read. Then they were let loose on an unlimited buffet. Blood samples taken before, during and after the activities found that thinking causes big fluctuations in glucose and insulin levels, which in turn led to a marked increase in caloric intake.