I have a book written by two naturopathic doctors complete with studies on vitamins and minerals etc. that were found to work just as well as many pharmacuietical drugs without the negative side effects. It also has a portion on heart health which brought out that the most effective number one important thing one can do to have a healthy heart is to be joyful. There by proving true the Bibles unfailing accuracy when it touches on such matters. It's found in Proverbs 17:22 "A heart that is joyful does good as a curer, but a spirit that is stricken makes the bones dry." Of course there are many other persons who have shown this to be the case as Norman Cousins, and Dr Hamer.