Six of one, half a dozen of the other?
80s schoolkid here.
On the one hand - more exercise (if only because cars were more expensive and less reliable and if you wanted to see a film, you walked or took the bus to the cinema - no VHS even).
Fewer economic opportunities for women, so more SAHM and part time Mums - until I was 12 maybe my Mum worked PT and was home before me so we could chat over tea and biscuits.
And no internet. Bad influences spread very slowly by post!
On the other hand...
Kids were expected to be seen and not heard ,and weren't particularly nurtured, until some time in the 90s (I think I even recall a Graunie article about how we should treasure our little darlings at about the time this sea change happened!)
Like a PP I had trichotillomania - this was "just a bad habit", NOBODY thought "Hey, her parents hate each other, her stepDad despises her, she's just moved schools and knows nobody and does 3h homework a night, maybe she's a bit tense?" We were all left to sink or swim really (mostly swam).
But I do wonder whether if kids' MH did get really bad, they'd just vanish out of school and die/end up in jail.
I was sent off to a "nice" school in my early teens, and MH usually starts tanking when puberty hits, so if anything went pearshaped with people from middle school I wouldn't have heard.
Don't recall any anorexics in my year of about 100 girls but we all knew it was a thing.
But mostly my guess is phones/internet/social media. Smoking for the brain. She said, hypocritically (am now going to put the phone down and do stuff though!!!).