I am currently reading my way through a long list of science fiction and fantasy titles. (http://www.npr.org/2011/08/07/138938145/science-fiction-and-fantasy-finalists if you are interested in the list).
Advice that I've gleaned so far:
Throw away your hand sanitizer and (outside cold & flu season) maybe don't wash your hands quite so fanatically.
Spend some time digging in dirt. Maybe let some of it stay under your fingernails for a while.
If you have the desire, get yourself a pet. Once again, don't worry about hand washing after touching them quite so much.
Much to my delight, don't get too bent out of shape about house cleaning. A bit of dirt is a good thing.
Eat lots of foods that will nourish your inner microbial garden: fruits, vegetables, legumes, whole grains. You know, that stuff that every book tells you to eat.
We are too clean and we eat too much junk.