Whole Grain Snacks Consumers are a great source for key nutrients that contain disease-fighting phytochemicals and antioxidants. Moreover, whole grains have some valuable antioxidants not found in fruits and vegetables, as well as B vitamins, vitamin E, magnesium, iron and fiber. The medical evidence is clear that whole grains reduce risks of heart disease, stroke, cancer, diabetes and obesity. Few foods can offer such diverse benefits.