Kelp has long been included in the human diet. It is popularly consumed in Japan. This may explain their low incidence of heart disease, high blood pressure, arthritis, respiratory disease and rheumatism. Kelp is especially high in iodine and also contains about 30 other minerals. Additionally, it has Vitamins C, D, E, K and B-complex. Iodine is known to help in the production of thyroid hormones. To maintain a proper metabolism, you must have a proper thyroid hormone balance. Kelp, because it is high in iodine, may boost metabolism and thereby help you to maintain or lose weight. Some research indicates that kelp may help maintain proper cholesterol levels. As a diuretic, it helps to eliminate bad bacteria from the bladder. It may also reduce inflammation and help ease the pain of rheumatoid arthritis.