People with thyroid issues should avoid consuming millets. Millets contain goitrogens, which are substances that can interfere with the absorption of iodine. Although cooking millets may reduce the level of goitrogens, it does not completely eliminate them. Therefore, individuals with thyroid issues should be cautious about consuming millets to ensure proper thyroid function. It is important to note that millets are high in fiber, which can cause digestive issues, such as gas and bloating, especially in individuals with sensitive stomachs. To overcome these problems, it is recommended to drink plenty of water while consuming millets.