>We are gradually losing the habits of our hunter-gatherer ancestors.

I half agree, and half disagree. We aren't losing the habits of our ancestors, we are losing *the targets* of them. What I mean is, we are still hunting and gathering, it is just that what we do and collect is useless for our lives. I think this is a big part of the depression factor too - we are making ourselves obsolete. 

> If we ask people with depression when was the last time they walked 10 thousand steps early in the morning, I think they will not respond positively.

This is interesting - and I think there is a strong correlation. Not sure if it is chicken or the egg, but exercise is something that makes pretty much every feel better, so why do so few of us do it consistently?

>Peer bullying is really one of the problems that needs to be paid attention to. My nephew suffers from this and does not want to go to school because of it.

Bullying is different nowadays in some ways also, but it needn't be. When I was a kid, I had a chance to get away from the bullies, by going home. Now, a lot of it is done online. Kids shouldn't be online like they are.