I guess I would be worried about overdoing it, even if omega-3s or other nutrients may be able to repair some of the damage. I'm now typically walking for around 70-90 mins per day (I would like to work up to about 2 x 60 min walks). In the bright summer sun, that is a lot of UV exposure. I am going to try to ensure I get direct light exposure some of the time, but will probably wear sunglasses at other times.