Studies now show that multitasking is bad for us. David Meyer at the University of Michigan says that:
“Multitasking contributes to the release of stress hormones and adrenaline, which can cause long-term health problems if not controlled, and contributes to the loss of short-term memory.”
Also, we may think we’re master multitaskers, but 98 percent of us really aren’t. Apparently, the brain requires a certain amount of bandwidth to move from one thing to the next and back again, affecting our performance on both tasks. This video by Sanjay Gupta, M.D. does a great job summing it up.