Barry Sears, Ph.D. explains it all. I highly recommend his book, The Zone. I also recommend his cook book, Zone Perfect Meals in Minutes. The affects of our diet on our imagery is great. If you are experiencing fatigue, irritability, worry, fear or paranoia, inability to cope, temper surges, depression, anxiety, or just don't feel your best, it very well could be your diet.
Poor diet urges negative imagery.
Negative imagery urges these behaviors.