Michael Savage, yes that one, is in expert on the topic and has written a couple of books on it. Highly recommend checking into it. Also, see if you can find the Vitamin Bible, and check out Dr. Eric Berg on youtube.
Yep. Two very trustworthy sources.
-Michael Savage
(Not advice I ever followed, but he seemed pretty sound on his facts. He also said to always ride a bicycle and to do balance and position exercises to get out in front of frailties and falls)