Pottawatomie County, Oklahoma (OK) County population in 2014: 71,811 (49% urban, 51% rural); it was 65,521 in 2000. County owner-occupied with a mortgage or a loan houses and condos in 2010: 10,798. County owner-occupied free and clear houses and condos in 2010: 7,617.
The Ornish diet is a low-fat, vegetarian diet with an emphasis on the inclusion of whole grains, beans, fruits, vegetables, (~70%-75% carbs), 15-25g fat (less than 10% of calories from fat), 15-20% protein. No animal products are allowed except egg whites and nonfat dairy products.
It's not even always about cutting out meat and dairy for weeks at a time. The VB6 diet, which advocates eating a vegan diet before 18:00, became the fad diet to follow after New York Times food writer Mark Bittman published his book last year. There are also any number of raw food, juice cleansing, soup slimming diets that involved cutting down on animal products.