it seems that science is a very inexact...science.
not too long ago, i posted some of the latest info, from newspaper review, of vitamin d requirements based on a large body of studies reviewed by experts. seems the numbers just keep getting more confusing - not too much, just this amount, no more than that amount, etc etc. now, here's a study that shows you need waaaaaaaaaaaaay more than what's been recommended to fight off cancer: http://www.healthcanal.com/cancers/14736-Higher-Vitamin-Intake-Needed-Reduce-Cancer-Risk.html?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+healthnewshc%2FOxfp+%28Health+News+from+HealthCanal.com%29
so what should we make of this? first of all, i'm not a biochemist, a dietitian, nor even a nutritionist - i'm just a personal trainer who's very well educated in the exercise and wellness field. an expert - i hesitate to claim that for myself, esp when it refers to nutrition. but i am smart enough, and well read enough, and maybe even intelligent enough to know this: just wait long enough and whatever else i think i know will probably be wrong. until then, however, you gotta keep on truckin'.
so, here's my spin on this controversy. while most of the data suggests a multivitamin is probably unnecessary, for some nutrients most of us require supplementation. if you don't spend a lot of time outside in the sun year 'round, and if you don't do vitamin d-reinforced dairy products in large amounts, and if you are older than, say, 55 and at risk of osteopenia/osteoporosis, then you need to supplement with vitamin d, and most likely calcium. how much to take? well, you can ask a doc, a dietitian, or read this article - which calls for way more than the newer recommendation of 800 IU - or at least get that minimum of 800. in the end, you will die either way, and who knows if it's from lack of d or other aspects of your life and lifestyle. but if you read this while young enough, let's just hope these docs are not too aggressive and you die from vitamin d overload. that'd be a real bummer.