Can weight gained after Iodine-131 treatment be lost?

Mar 13, 2025 Source: Cainiu Health

Dr. Yang Ziqi

Introduction

Weight gain after I-131 treatment generally can be reduced once thyroid function returns to normal and lifestyle habits are adjusted. However, if the weight gain is caused by medication side effects or a decreased basal metabolic rate, it may be more difficult to lose weight. After I-131 treatment, patients should closely monitor their weight changes and communicate with their doctor in a timely manner. At the same time, maintaining healthy lifestyle and dietary habits is important.

Weight gain after iodine-131 treatment usually subsides once thyroid function returns to normal and lifestyle habits are adjusted. However, if the weight gain is due to drug side effects or a decreased basal metabolic rate, it may be more difficult to lose the excess weight. If concerned, it is recommended to consult a doctor in advance. Detailed explanation is as follows:

In most cases, weight gain after iodine-131 treatment is due to changes in thyroid function caused by the therapy, which subsequently affects the body's metabolism. As treatment progresses and thyroid function gradually recovers, the patient's metabolic rate will also gradually return toward normal. At this point, if the patient can adjust their diet to reduce intake of high-calorie foods and incorporate appropriate physical activity, body weight may gradually return to a normal level.

In a minority of cases, weight gain after iodine-131 treatment may be related to drug side effects or a decrease in basal metabolic rate. If the patient has an unusual reaction to iodine-131 that disrupts hormonal balance and causes weight gain, or if the basal metabolic rate decreases after treatment, resulting in reduced energy expenditure and increased fat accumulation, weight loss in such cases may be difficult to achieve through simple dietary and exercise adjustments.

After iodine-131 treatment, patients should closely monitor changes in their body weight and communicate promptly with their physician. Additionally, maintaining healthy lifestyle and dietary habits and undergoing regular thyroid function tests are important to ensure the safety and effectiveness of the treatment.

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