Excessive iodine consumption can raise blood glucose and blood pressure, has an effect on blood lipids, and increases the risk of hypertension and diabetes. Iodine is needed for production of thyroid hormone by the body. Iodine is required to produce thyroid hormone, which controls metabolism. Therefore, if the body does not get enough iodine it will not be able to make enough thyroid hormone which controls metabolism. Metabolism controls how your body uses energy food goes into your bloodstream to provide the energy that your muscles need to function properly. If you do not get enough sleep or exercise your body will use the energy in your food instead causing weight gain. Iodine is found in seaweed, seafood, dairy products, and some vegetables. It is also added to certain foods such as salt, bread, and cereal. The amount of iodine you need varies depending on how much salt you eat. If you add too much iodine to your diet it can cause problems for people who are already at risk of developing heart disease, diabetes, or having a stroke. These individuals need more iodine but not more than what is found in most common dietary supplements. Other groups of people may be more sensitive to iodine and should not consume more than suggested amounts. Too much iodine can be harmful to your health.