People with thyroid issues should avoid eating millet. Millet contains goitrogens, which are compounds that can interfere with the absorption of iodine. Reduced iodine absorption could exacerbate thyroid problems for individuals with thyroid issues. It is important to note that cooking millet may reduce the goitrogenic effects, but it does not completely negate them. Therefore, individuals with thyroid issues should exercise caution and consult with their healthcare provider before consuming millet or any other goitrogenic foods.