There are no three types of people who should not eat kelp. However, kelp is extremely rich in iodine, so patients with hyperthyroidism, thyroid nodules and thyroid disorders such as Hashimoto’s thyroiditis need to control their intake. Each 100 grams of kelp contains 13 calories, 2.1 grams of carbohydrates, 1.2 grams of protein, 0.1 grams of fat and 46 milligrams of calcium. Kelp is extremely rich in iodine and is known as the king of iodine-containing foods in nature, with each 100 grams of kelp containing 20mg to 70mg of iodine. According to China’s nutrient intake reference standard, healthy adults daily intake of iodine reference value of 120 micrograms, the highest 600 micrograms. 10g of kelp iodine content, far more than the average daily recommended intake of iodine, even the normal population, should not be too much intake of kelp. Patients with hyperthyroidism should avoid eating kelp, while Hashimoto’s thyroiditis and thyroid nodules should also consume as little kelp as possible to ensure good health.