My husband had slight rickets when I first met him; his legs are a bit curved. He hadn't had a good diet from infancy (just white rice and a few vegetables).
The sun in his homeland is very strong of course, but it didn't seem to rectify the lack of vitamin D. He takes supplements now, and eats plenty of vitamin D-rich food.
Bonzo, archaeology sounds extremely interesting! I agree it's a good idea to profit from the Lockdown and study something.
(for me - Crumpetology?)