Why are children more vulnerable to biotoxins?

The modern generation of children spends more time indoors than any previous generation. Remember your own childhood; going outside was always a joy for us. We had friends, games, and couldn’t be dragged back home in winter or summer. Now you can’t even persuade children to leave the house!
It’s no longer a punishment when you say, “Don’t go outside today!” It’s exactly what children want - not to go anywhere and sit in front of their phone, computer, tablet, or television screen. But there is an opinion that this is one of the main reasons for the high prevalence of health problems among today’s youth.