Too much screen time affects one's mental health, how you say?? Too much screen time alters the very structure of the brain causing the grey matter that's responsible for cognitive processes to shrink, as well as deform the white matter that serves as the network to the brain's signal communication. This begins to manifest as poor concentration, weaker memory, slower information processing and weaker impulse control – these effects are particularly worrying when itcomes to children, whose brains are still developing. Source: Active Health