insoluble fiber sources
Sources of insoluble fiber include: 1  whole grain foods. 2  wheat and corn bran. 3  legumes such as beans and peas. 4  nuts and seeds. 5  potato skins. 6  lignans. 7  vegetables such as green beans, cauliflower, zucchini (courgette), celery, and nopal.ources of insoluble fiber include: 1  whole grain foods. 2  wheat and corn bran. 3  legumes such as beans and peas. 4  nuts and seeds. 5  potato skins. 6  lignans. 7  vegetables such as green beans, cauliflower, zucchini (courgette), celery, and nopal.