Why do you think that fasting is going to help a thyroid problem? When you have hypothyroidism, you need medication to help you lose weight. Your thyroid controls your whole body. Your metabolism slows down when you have hypothyroidism, which makes it harder to lose weight. Once hypothyroidism is treated, then you can start to lose weight.
There are certain vitamins you can take to help along with the medication. On this website there are other alternative treatments that can help your body like cleansing.
There are health risks that can happen if you do not control a thyroid problem. I have hypothyroid, and take thyroid medication twice a day.