A 1-cup serving of regular, quick or instant plain oatmeal contains 56 grams of carbohydrates, which is 19 percent of the recommended daily value. Eight carbohydrate grams are from dietary fiber, and 1 gram is sugar.
One cup of oatmeal also has 11 grams of protein and 5 grams of fat. One gram is saturated fat, and there are no trans fats. The total calorie count is 307.
An oatmeal serving has no cholesterol and only 5 grams of sodium. The cereal provides 4 percent of the daily value for calcium and 19 percent for iron. It is also a good source of phosphorus, selenium and manganese.