Kelp as a food is generally not particularly bad, but eating too much of it may cause excessive iodine intake and thyroid disease. Kelp is a kind of edible sea brown algae in low-temperature seawater, its nutritional value is relatively high. Kelp is also rich in minerals, including iodine, which contains 923μg per 100g, vitamin K (66μg/100g), folic acid (180μg/100g) and other nutrients. Moderate consumption can satisfy the needs of the body and enhance the body’s nutrition. However, if consumed in excess, too much iodine is ingested in the body, which can lead to problems such as goiter and hyperthyroidism. In addition, stomach bloating, diarrhea and other uncomfortable symptoms may also occur. Therefore, it is important to consume kelp in moderation on a daily basis, and it can be consumed with other fresh vegetables, but it is generally not recommended for patients with hyperthyroidism.