List of 10 Foods to Avoid in Thyroid: The thyroid is known to be a human gland that secretes hormones essential to maintaining the production and utilization of energy. All bodily functions like heart rate, breathing, metabolism, and even body weight are controlled by the thyroid hormones. Excess or reduced secretion of thyroid hormones can pose many medical issues in humans. To avoid all these, we need to neglect some food items from our diet chart.