Digital dementia occurs when one part of the brain is overstimulated and another part of the brain is understimulated.

In the United States, it’s estimated that at least 7 million people over the age of 65 have dementia. If current trends continue, by the end of the decade, more than 9 million Americans are expected to suffer from this loss of cognitive functioning—that’s equivalent to the population of New York City.

Memory impairment isn’t just affecting the elderly. By 2050, the number of U.S. adults over the age of 40 living with dementia is expected to more than double, from 5.2 million to 10.5 million. To compound matters, there’s a new type of dementia plaguing Americans, one that’s affecting people much younger than 40. It’s called digital dementia, and millions of unsuspecting, young Americans are at risk.

A major health epidemic, digital dementia occurs when one part of the brain is overstimulated and another part of the brain is understimulated. When we mindlessly use digital devices, the frontal lobe, which is responsible for higher-level executive functions, gets little, if any, use. Meanwhile, the occipital lobe, the visual processor located at the back of the brain, gets bombarded with sensory input. Slouched over and spaced out, people, both young and old, are abusing their brains, day in and day out. Preteens and teens are particularly at risk for two reasons: