Hyperthyroidism is caused by where the thyroid gland is overactive. So when you area taking treatment for that, you have to avoid the goitrogenous foods, which are processed foods millets, all kinds of millets you have to avoid and all the unhealthy fats. So the healthy foods for the thyroid problems is cold pressed coconut oil, mustard oil sesame oil, olive oil. You gave to avoid also cruciferous vegetables like all cabbage family, all soya products and butter and peanuts, etc, while you have to take more of Omega 3 rich food like you can take Omega 3 rich supplementation also and all the coloured vegetables and foods also which are very rich in phytonutrients and also iodine rich foods like mushrooms and dry fruits, ofcourse dry fruits cannot be taken in the morning. But late afternoon, you can take dry fruits, especially the mixed dry fruits because they are the rich source of all the minerals. So just take care of all your health by taking the non goitrogenous foods. So I suggest that you go for a guided diet plan. Also you have to restrict thee caffeine and alcohol and all the sugary beverages.