 Multitasking may be damaging your brain and has been proven to lower your IQ, especially for men. Their IQ scores dropped to the average range of an eight-year-old while multitasking. Another study found that people who spend a lot of time on multiple devices had less brain density and were more prone to anxiety and depression. Plus, it's not very efficient. Our brains can really only handle one task at a time. We're wired this way. One study found that only 2.5% of people are able to multitask effectively. So chances are, you're just working slower and making more mistakes.