Polyunsaturated fatty acids (PUFAs) are essential fats the body cannot make. The notation n-6 (18:2) specifically refers to linoleic acid, an omega-6 fatty acid with 18 carbon atoms and 2 double bonds.
Different grains have varying nutritional profiles, including their fatty acid content. Factors like grain type, processing, and specific variety influence the amounts.
Among the common grains listed, wheat flour is recognized as a significant source of the polyunsaturated fatty acid linoleic acid (18:2 n-6). While other grains like oats also contain fats, wheat flour generally provides a higher concentration of this specific omega-6 fatty acid compared to barley and rye flour.
The nutritional content, especially fat, can be affected by processing. Whole wheat flour typically retains more of these beneficial fatty acids compared to refined white flour.
Therefore, wheat flour is identified as a source high in polyunsaturated fatty acid n-6 (18:2).