Navy beans are an excellent source of cholesterol-lowering fiber, as are most other beans. In addition to lowering cholesterol, navy beans' high fiber content prevents blood sugar levels from rising too rapidly after a meal, making these beans an especially good choice for individuals with diabetes, insulin resistance or hypoglycemia. When combined with whole grains such as brown rice, navy beans provide virtually fat-free high quality protein. But this is far from all navy beans have to offer. Navy beans are a very good source of folate and manganese and a good source of protein and vitamin B1 as well as the minerals phosphorus, copper, magnesium and iron.