2. Weight Changes
If you’ve tried every low-fat, low-carb, low-calorie diet with little weight loss success, you might have hypothyroidism. An underactive thyroid gland is like miring your metabolism in quicksand, slowing it down to the point of ineffectualness.
With an overactive thyroid, or hyperthyroidism, patients usually cannot gain weight no matter how much they eat. This is because overly active thyroids push metabolisms to warp speed, causing the body to burn calories like rocket fuel. Many patients also experience dramatic and unexplained weight loss.