According to the U.S. Census Bureau, the county has a total area of 526 square miles (1,360 km 2), of which 504 square miles (1,310 km 2) is land and 22 square miles (57 km 2) (4.2%) is water.
Grain products are the leading source of carbohydrates in the American diet. Grains naturally contain high concentrations of starch, which your gastrointestinal system breaks down into sugars. Common grains in the U.S. diet include wheat, oats, rice, barley and cornmeal.
These whole plant foods are great sources of complex carbohydrates: 1  Green vegetables. 2  Whole grains and foods made from them, such as oatmeal, pasta, and whole-grain breads. 3  Starchy vegetables such as potatoes, sweet potatoes, corn, and pumpkin.4  Beans, lentils, and peas.hese whole plant foods are great sources of complex carbohydrates: 1  Green vegetables. 2  Whole grains and foods made from them, such as oatmeal, pasta, and whole-grain breads. 3  Starchy vegetables such as potatoes, sweet potatoes, corn, and pumpkin.