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.
Calories are calculated based on the amount of fat, carbohydrates and protein per gram of the food. The highest calorie foods are pure fats; the purest fat foods are the oils. So, e.g.. olive oil has 8.8 calories per gram, as does corn oil, palm oil and other edible oils. Butter is not quite as pure a fat, but it still has 7.1 calories per gram (butter has a small amount of protein). If you mean foods that people eat as is (rather than the above, which are ingredients) you would look for the foods that are the purest fat (and least water).