I think once people start up with more hygienic practices, many will stick to them after the virus scare is over. Once people have bidets, they’re not going to go back to mushing poo all over themselves and pretending they’re clean. Once someone starts washing their hands, it’s gross to not do so.
I’m not sure about the weight loss. People are not stocking up on fresh veggies and salmon.
There could be a spike in sex which is healthy. I’ve already heard jokes about the Coronial generation to start in December.