top of page
  • Writer's pictureThe After Cancer

Weight gain in cancer patients: understanding the causes and solutions

Cancer survivor happily eating a healthy meal after receiving help from the after cancer clinic on how to maintain a healthy weight as he had gained weight during cancer treatment.

Weight gain is a common concern among cancer patients, and it can be caused by various factors, including the type of cancer and treatment received. Weight gain can be just as frustrating and challenging to manage as weight loss, and it's essential to understand the underlying causes to address the issue effectively.

Why do cancer patients gain weight?

Cancer patients can gain weight due to several reasons, such as:

  1. Treatment side effects: Certain cancer treatments, such as chemotherapy and hormone therapy, can cause weight gain. These treatments can affect the body's metabolism, increase appetite, and cause fluid retention, leading to weight gain.

  2. Reduced physical activity: Many cancer patients experience reduced physical activity levels due to their treatment, which can lead to weight gain. Chemotherapy and radiation therapy can cause fatigue, which can make patients less likely to engage in physical activity.

  3. Hormonal imbalances: Some cancers can cause hormonal imbalances, which can lead to weight gain. For example, breast cancer and ovarian cancer can cause estrogen imbalances, which can lead to weight gain.

  4. Emotional eating: Cancer diagnosis and treatment can cause emotional distress, leading to overeating and weight gain. Stress can increase the production of cortisol, a hormone that can increase appetite and cause weight gain.

Types of cancer associated with weight gain

Certain types of cancer are more likely to cause weight gain than others. These include:

  1. Breast cancer: Breast cancer patients receiving hormone therapy, such as tamoxifen, are at a higher risk of weight gain.

  2. Prostate cancer: Hormone therapy for prostate cancer can cause weight gain.

  3. Colorectal cancer: Colorectal cancer patients may experience weight gain due to surgery and changes in bowel function.

Nutrition and a healthy diet

Maintaining a healthy diet is essential for cancer patients, whether they are trying to gain or lose weight. Eating a balanced diet can help patients manage their weight, reduce the risk of side effects, and improve overall health.

A healthy diet for cancer patients should include:

  1. High-calorie and high-protein foods: These foods can help cancer patients gain weight and rebuild tissue damaged by cancer treatments.

  2. Fruits and vegetables: These foods are rich in nutrients and can help reduce the risk of cancer recurrence.

  3. Whole grains: Whole grains can help provide energy and reduce the risk of constipation.

  4. Healthy fats: Healthy fats, such as those found in avocados and nuts, can help cancer patients maintain a healthy weight.

It's important to work with a registered dietitian or nutritionist to create an individualized nutrition plan based on the patient's needs and preferences.

Managing weight gain during cancer treatment

Weight gain during cancer treatment can be challenging to manage, but there are several strategies patients can use to help maintain a healthy weight:

  1. Engage in physical activity: Regular exercise can help cancer patients maintain a healthy weight, reduce the risk of side effects, and improve overall health. Patients should talk to their healthcare team before starting any exercise program.

  2. Monitor weight: Patients should weigh themselves regularly and keep a log of their weight to track any changes.

  3. Eat smaller, frequent meals: Eating smaller, more frequent meals throughout the day can help cancer patients maintain a healthy weight.

  4. Manage stress: Stress can cause emotional eating, leading to weight gain. Patients should find ways to manage stress, such as meditation or yoga.

  5. Seek support: Family members and friends can offer support and encouragement, making it easier for cancer patients to manage weight gain and maintain a healthy lifestyle.


Weight gain in cancer patients can be a significant concern, but it is important to remember that it can be managed. Discuss any changes in weight with your healthcare team, focus on a healthy and balanced diet, engage in physical activity, manage fluid intake, and consider hormonal therapy if necessary. With the right support and guidance, cancer patients can maintain a healthy weight and improve their overall quality of life.


Get started with The After Cancer to achieve a healthy weight


Les commentaires ont été désactivés.
bottom of page