A: Because the onset of the disease is often so gradual, many people with hyperthyroidism can enjoy years of fear-free eating and weight loss before their disorder is properly diagnosed. And it’s not unusual for these individuals to develop unhealthy eating habits. Unfortunately, once hyperthyroidism is treated, the weight loss is rarely sustained.

You are among the lucky ones receiving drug treatment. On the recommended doses of anti-thyroid medication, most patients regain between five and 10 pounds within the first three weeks. However, your weight should stabilize after that –provided you have returned to a healthy body weight and abandoned bad eating habits. I have two suggestions for you: First, talk to your doctor about decreasing your medication. If she feels that you are on the minimal dose required to manage your illness, then substitute 25 to 30 minutes of high intensity interval training (HIIT) for the cardiovascular component of your exercise regimen.

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Dr. Chris Lydon is a graduate of the Yale School of Medicine. She is also a health writer and physique model.