A single slice of commercially prepared whole wheat bread (shown on label) provides almost 70 calories, and about 1 gram of fat. The slice also provides almost 4 grams of protein and 11.6 grams of carbohydrate. But since it also provides about 2 grams of fiber, you'll only consume about 9.6 net carbs per slice. Remember however, that you need to double those nutrition counts if you make a sandwich with two slices of bread.