Hello and thank you for the question. Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormones. The weight gain associated worth hypothyroidism is troublesome, and, as long as the hypothyroidism remains untreated, weight loss will be difficult. Choose healthy foods that are full of healthy calories. Lean protein, low fat dairy and whole grain carbohydrates are all good choices. Do more physical activity,exercise. Take synthetic thyroid medication regularly, as your doctor prescribed it. Be patient, its challenging but not impossible. Best regards!