Studies show that loss of tissue mass in people who are on eletronic screens in areas called gray matter, used to process. It also effects sleep and memory.
The blue light emitted from screens strikes melanopsin in the back of our eyes, triggering headaches. The US Health Department suggests zero screen time for 2 years and under, and 1 hour for 2 to 5 year olds. But screen use is NOT all bad. People like cashiers use computers do scan barcodes, log stuff into systems, etc, etc. In fact, some studies say computers BOOST brain creativity. If you do decide to download apps, get ones that start from scrap, like Minecraft, etc, etc.
Studys say games that reward you even when you don’t complete it makes people become “lazy.” Conclusion: It is ok to use screen time, just limited.