People with thyroid issues especially need to follow a diet that supports the metabolism. The metabolism isn't just about the thyroid: It involves the gallbladder, adrenals, liver, pancreas, pituitary - pretty much your whole body. The food on the Fast Metabolism Diet is designed to support a healthy and efficient metabolism; it's the way we all should be eating. Many of Haylie's clinical clients have thyroid issues, and have been referred to her by their doctors. She has helped them meet their health and weight loss goals using her Fast Metabolism principals. As with any new diet, and particularly if you have a specific medical issue, it's wise to talk to your doctor. Take the book with you and discuss the plan with him or her.