Whole grain products, pastas and cereals contain thiamine. Manufacturers fortify breads and cereals with B vitamins, especially foods such as white flour or white rice, because refining the foods destroys the natural thiamine found in the food.Yeast in bread products also contains thiamine.oods such as dairy products, vegetables and fruits do not have large amounts of thiamine, but do have some. Eating these foods in large amount may contribute a significant amount of thiamine for the body, according to the University of Maryland Medical Center.