Apparently over 40% of Americans are deficient in vitamin D
I guess that there is a good chance that the statistics for those of us who work with computers and spend most of our time indoors are likely to be similar. I have been taking a vitamin D supplement for a while and that seems to have helped somewhat with my general well-being. I have also read that the process of making vitamin D in your skin also triggers other processes that are linked to reducing cancer risk, improving testosterone levels and helping cope with stress.
I am making a concerted effort to get more sunlight exposure this summer so that I can improve my vitamin D levels and see if it effects how I feel. So far I have been wondering around the garden without a shirt on in the sunshine for half an hour in the evening or whilst mowing the lawn. If nothing else, I guess I'll get something of a tan.