Thank you Sandra, it helps so much to have this support on Mudcat.
And I'm so sorry Ebbie for your losses. A hug from me too.
I think you're right Steve, because my sister was extremely vigilant about her food. She must have been the most correctly-fed person in Scotland, because she always made sure her diet was beautifully balanced and complete regarding all the vitamins, minerals and essential things. (Organic food from farmers' markets etc) She was so active and strong it was phenomenal. Whizzing up mountainsides, playing table tennis for a team, going for ten-mile hikes. etc. So I imagine that the vitamin D levels in her body were as they should be.
I suppose however up in Scotland the sunshine is more scarce, whereas I'm as brown as a berry down here in Norfolk, sunning myself on The Bench. (But not in a bikini -wouldn't want to alarm the locals!)