spring wheat contains about 15.4 grams of&nbsp; protein , 1.9 grams of total&nbsp; fat , 68 grams of&nbsp; carbohydrate &nbsp;(by difference), 12.2 grams of dietary&nbsp; fiber , and 3.6&nbsp;mg of iron (20% of the daily requirement). [ 29 ] Much of the carbohydrate fraction of wheat is&nbsp; starch . Wheat starch