What foods should patients with hyperthyroidism avoid?
Jul 10, 2025
Source: Cainiu Health
Dr. Yang Chuanjia
Introduction
Kelp contains a large amount of iodine, which is a raw material for synthesizing thyroid hormones. Excessive intake can increase thyroid hormone secretion and worsen symptoms of hyperthyroidism; therefore, its consumption must be strictly controlled. Nori is also very high in iodine content. Consumption by hyperthyroid patients can lead to increased iodine load in the body, overstimulate the thyroid gland, and negatively affect hormonal stability, thus its intake should be reduced. Most sea fish contain relatively high levels of iodine.
Hyperthyroidism generally refers to hyperfunction of the thyroid gland. Usually, there are no absolute dietary restrictions for patients with hyperthyroidism, but it is recommended to avoid consuming large amounts of kelp, nori, sea fish, iodized salt, strong tea, and similar foods. Detailed explanations are as follows:
1. Kelp: Kelp contains a large amount of iodine, which is a raw material for synthesizing thyroid hormones. Excessive intake may promote increased secretion of thyroid hormones, thereby worsening symptoms of hyperthyroidism; intake should be strictly controlled.
2. Nori: Nori has a very high iodine content. Consumption by patients with hyperthyroidism may lead to increased iodine load in the body, stimulating excessive thyroid activity and destabilizing hormone levels; consumption should be reduced.
3. Sea fish: Most sea fish contain relatively high levels of iodine, especially hairtail and sea bass. Consuming large amounts may provide sufficient raw materials for thyroid hormone synthesis, exacerbating the hypermetabolic state and affecting disease management.
4. Iodized salt: Iodized salt has a relatively stable iodine content. Long-term excessive consumption continuously supplies iodine to the thyroid gland, leading to hormonal imbalance. Patients with hyperthyroidism should choose non-iodized salt.
5. Strong tea: Strong tea contains caffeine, which can stimulate the nervous system, aggravating symptoms such as irritability and insomnia in patients with hyperthyroidism. It may also affect the efficacy of antithyroid medications; excessive consumption should be avoided.
Hyperthyroidism patients must strictly control iodine intake. The above-mentioned foods are not absolutely prohibited but should be consumed in moderation. Patients can choose low-iodine foods such as freshwater fish, lean meat, fresh vegetables, and fruits in daily meals to maintain stable thyroid function.
