How to Gain Weight During Chemotherapy

If you've been diagnosed with cancer, chemotherapy agents (medications) will most likely be used to cure the disease, shrink a tumor, prevent the cancer from spreading, or relieve the symptoms of the disease.[1] This is done through injections, IVs, pills, or indirect injections to fluid around your spinal cord and brain. Regardless of how the chemotherapy is administered, it works by killing fast growing cells. Unfortunately, this type of treatment can cause you to lose your appetite and/or experience nausea, which can result in weight loss. In this article, you can learn how to prevent weight loss, put on weight during treatment, and understand the importance of a healthy weight.

Part 1
Part 1 of 3:

Preventing Weight Loss

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    Track your weight. Since preventing weight loss is easier than trying to gain weight during treatment, keep an eye on your weight. Get on the scale at least three times a week. It’s easy to lose track of how much you are losing when you are experiencing the side effects of chemotherapy. Your healthcare team will look for trends in your weight.[2]
    • For those who start treatment at a healthy weight with a healthy Body Mass Index (BMI), a 1 to 2% loss over a week or 5% loss over a month are causes for concern. Put another way, this equates to a 150-pound person losing about 3 pounds in a week or 7.5 pounds in a month.
    • Your healthcare team may become concerned with a smaller amount of weight loss if you were underweight initially when you began treatment. Similarly, they may be less concerned with a more significant amount of weight loss if you were overweight initially.
    • Don't stress if you do lose weight immediately after a chemotherapy treatment. This is normal. Your healthcare team wants to track your weight to determine whether or not you can regain that loss by the time you arrive for your next treatment.
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    Take anti-nausea medication. Your doctor may prescribe a medication to treat nausea and vomiting at the time of or days following your treatment. Anti-nausea drugs are available as an IV medication, pill, liquid, patch or suppository.[3] Chemotherapy treatments can cause nausea and vomiting, which happens when you experience the symptoms of chemotherapy the day before you get the treatment. Or, some patients get delayed symptoms a day or two after treatment.
    • These drugs usually fall into the category of corticosteroids, serotonin antagonists, dopamine antagonists, NK-1 inhibitors, cannabinoids, motion sickness treatments, anti-anxiety drugs and stomach acid blockers.
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    Practice good hygiene. Because the chemotherapy affects your bone marrow and immune system, you are more at risk for infections. Fever and infections will reduce your appetite, making it harder to maintain a healthy weight. Always wash your hands carefully after using the bathroom, being in public, or around family and friends.[4]
    • If a friend or family member is sick and infectious, use caution or avoid being around the person until the disease can't be transferred to you.
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    Get exercise. Before you start exercising, get approval from your cancer doctor and talk to them about safety measures that your should take. It’s safest to exercise in a medical setting with a partner, instead of exercising alone in public facilities that have an increased risk of infections. Know that you should stop if you feel disoriented, notice sudden onset of nausea and vomiting, shortness of breath, irregular heartbeat, chest pain, leg or calf pain, bone pain, or unusual fatigue.[5] A supervised resistance and aerobic exercise program is helpful for cancer patients, especially because too much rest will lead to weakness, muscle loss and reduced range of motion.[6] Exercise can:
    • Improve physical ability
    • Improve balance and reduce the risk of falls and broken bones
    • Reduce muscle wasting from inactivity
    • Lower the risk of heart disease and osteoporosis
    • Improve self-esteem
    • Lessen nausea and lower the risk of anxiety and depression
    • Improve your quality of life
    • Improve your appetite
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    Reduce your alcohol intake. Talk with your doctor about limiting how much alcohol you drink before and after chemotherapy treatments, since most chemotherapy agents are metabolized through the liver, just as alcohol is. If your liver is metabolizing alcohol, this can change the way in which the chemotherapy medication is used in the body and can cause drug interactions. This can cause liver damage which increases nausea and vomiting, triggering more weight loss.[7]
    • If you're dealing with mouth sores, you may notice that even a little alcohol in mouthwash can irritate mouth sores and make them worse. This will make eating more painful and increase the potential for greater weight loss. Opt for non-alcoholic mouthwash or children's mouthwash, and consider switching to an organic toothpaste to avoid these issues.[8]
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Part 2
Part 2 of 3:

Gaining Weight

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    Take medication. Your doctor may prescribe a combination of megestrol acetate (Megace), corticosteroids and anti-anxiety drugs to reduce your weight loss and prevent muscle loss. The dosage of each may need to be adjusted through the course of your treatment, depending on your condition.[9] Other medications that may be considered include Oxandrolone or Dronabinol. Oxandrolone is an anabolic steroid used to encourage weight gain after a trauma by promoting the building of muscle tissue.[10] Dronabinol is used to treat anorexia, nausea, and vomiting in patients who are undergoing chemotherapy or radiation therapy to treat cancer.
    • Sometimes your lack of appetite or weight loss is caused by another treatable condition, such as depression, pain, or anxiety.[11] Your physician can help with medication or recommendations for behavioral therapy which will reduce your depression or anxiety and increase your appetite.
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    Have snacks and foods ready to eat. Before you start your first treatment, make sure you have lots of pre-cooked foods and snacks you know you enjoy already prepared. Stock your pantry and fill your freezer. You should also ask friends and family to help you with shopping, cooking, and cleaning while you're feeling badly. Planning ahead for eating will make it easier to focus on treatment plans and regaining your strength.[12]
    • Talk with your healthcare team about measures you should be taking to prevent constipation.
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    Change how you eat. Avoid trying to eat a few large meals each day, as this can make you feel nauseous. Instead, eat as much of a meal as you can whenever you feel the hungriest during the day. Throughout the day you should have snacks every few hours, without waiting until you feel hungry. Pack things like trail mix or protein shakes to make up the difference in calories if you can't eat a full meal.
    • Drink most of your fluids between meals and/or snacks instead of with them. Fluids will fill your stomach and make you feel like you are full but without having consumed enough calories, so it’s best to drink fluids when you aren’t eating.
    • High energy foods like nut butter on toast, granola and whole milk, pudding, full-fat yogurt, smoothies, cheese & crackers, dried fruit with nuts, and avocado toast will fuel you with every bite.[13]
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    Replace solid foods with liquid foods. If you find that eating solid foods is difficult or unappetizing, start eating soups or drinking smoothies to get your calories. Try to use protein-fortified milk when cooking or mixing up beverages. To make protein-fortified milk, mix 1 quart of whole milk with 1 cup of nonfat instant dry milk. Beat the mixture until the powder dissolves, about 5 minutes. Or, try some of the following soup and smoothie suggestions:[14] [15]
    • For a tangy protein smoothie: Blend ⅓ cup of cottage cheese or plain yogurt, ½ of cup vanilla ice cream, ¼ cup of prepared fruit-flavored gelatin (you can use an individual ready-to-eat snack cup), and ¼ cup of low-fat milk until they're combined. Drink immediately.
    • For hearty soups, make sure to include beans or meat and plenty of vegetables. You might try making a turkey minestrone or chicken and white bean soup.
    • For a high-protein milkshake: Blend 1 of cup protein-fortified milk, 2 tablespoons of butterscotch sauce, chocolate sauce, or your favorite fruit syrup or sauce, 1/2 cup of ice cream, and 1/2 teaspoon of vanilla extract till combined. Drink immediately.
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    Get more calories and protein. Try to consume some extra calories each day to strengthen your body. This can mean adding a glass of milk to each meal or snack, eating peanut butter and crackers or trail mix during the day, or having a scoop of premium ice cream at night.[16] You will also need more protein to help build muscle and cells. Drink a pre-mixed protein shake, such as Ensure Original, each day to help boost your calories and your protein.
    • As an alternative, sprinkle some protein powder into your oatmeal or cereal.
    • Consider asking your doctor about lipids in liquid form, as they can be added to your diet to increase your caloric intake.
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    Take fish-oil supplements. Research has shown that fish-oil supplements can help prevent muscle and weight loss as well as combat malnutrition.[17] Fish oil high in omega-3 fatty acids helps to maintain or gain muscle mass. Krill oil supplements are also high in omega-3 fatty acids.
    • Omega-3 fatty acids are also found in walnuts and tuna fish.
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Part 3
Part 3 of 3:

Learning About How Chemotherapy Affects Your Weight

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    Recognize symptoms of digestive system cell loss. Chemotherapy is given through the bloodstream to kill fast growing cells throughout the entire body. This can interfere with your digestive tract’s natural ability to function, which can trigger weight loss. Simple changes in your digestive tract can cause:[18]
    • Mouth sores
    • Dry mouth or swelling in the mouth
    • Poor appetite
    • Vomiting and/or diarrhea
    • Changes in the ability to taste food
    • Fatigue and constipation[19]
    • Dental and gum problems[20]
    • Nervous system damage
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    Realize how cancer can cause you to lose weight. Some tumors produce small proteins (cytokines) that can reduce your appetite and cause nausea. You may also lose your appetite simply from the anxiety of dealing with the disease. This lack of appetite can lead to weight loss.[21] You should know that:[22]
    • Not everyone gets the same side effects from the same medications.
    • The severity of the side effects will also vary.
    • There are medications and choices you can make that will help prevent and alleviate some of the side effects.
    • Although side effects are unpleasant, they must be weighed against the benefits of treating the cancer.
    • Most of the side effects associated with loss of appetite and weight loss will resolve fairly quickly, over a couple of weeks or months. But, the time it takes to regain energy and appetite will vary from person to person.
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    Accept that a healthy weight is important during treatment. Weight loss reduces the energy and nutrients your body needs to recover. Because chemotherapy kills other rapidly dividing cells, your body needs adequate nutrition to replace those cells. Poor nutrition makes healing and recovery more difficult.[23] If you can prevent weight loss during treatment or gain weight after losing it, you'll improve the potential success of the chemotherapy, as those who maintain a good body weight have a higher chance of success.
    • Research shows that patients who were able to stabilize their weight reported better outcomes.[24]
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    Prepare for changes in food taste. Chemotherapy can change the way food tastes, making it hard to have a healthy appetite. You may notice that food isn't as flavorful, tastes too salty, tastes too sweet, or things (like meat) don't taste right. Fortunately, there are several things you can try to adjust to these changes. For example:[25]
    • If food isn't as flavorful, add sauces, syrups, or garnishes to your food that boost salty, sweet or spicy flavors.
    • If food tastes too sweet, add salty or sour flavorings or dilute your beverages. You can also add things like yogurt, buttermilk, or coffee to balance out overly sweet things.
    • If food tastes too salty, add a little sugar to counteract the salt. You should also look for low-sodium products or rinse canned vegetables before using them to remove excess salt.
    • If meat doesn't taste right, try replacing it with another protein such as beans, cheese, tofu, nut butters, yogurt, fish, or poultry.
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Expert Q&A
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  • Question
    What can a cancer patient eat to gain weight?
    Find BC Dietitians
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    Registered Dietitians Group
    Find BC Dietitians is a central hub of qualified nutrition experts in British Columbia, Canada with a mission to connect people to a registered dietitian best suited for their needs. BC Dietitians offer online consultations and provide evidence-based care on a wide range of nutrition matters such as diabetes, weight management, food allergies, eating disorders, and intuitive eating.
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    Every bite counts so focus on higher energy foods such as: nut butter on toast, granola & whole milk, pudding, full fat yogurt, homemade smoothies, cheese & crackers, dried fruit with nuts, avocado toast, and healthy fats such as olive, avocado, or canola oil. Eating regularly will also help you gain weight. Start by eating something small within 2 hours of waking up, then try to have small meals and snacks every 2-3 hours.
  • Question
    What are the best foods to eat while on chemotherapy?
    Find BC Dietitians
    Find BC Dietitians
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    Find BC Dietitians is a central hub of qualified nutrition experts in British Columbia, Canada with a mission to connect people to a registered dietitian best suited for their needs. BC Dietitians offer online consultations and provide evidence-based care on a wide range of nutrition matters such as diabetes, weight management, food allergies, eating disorders, and intuitive eating.
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    Healthy fats such as olive, avocado, or canola oil can be added to lower-calorie foods like veggies to increase the caloric value.
  • Question
    When should a cancer patient eat?
    Find BC Dietitians
    Find BC Dietitians
    Registered Dietitians Group
    Find BC Dietitians is a central hub of qualified nutrition experts in British Columbia, Canada with a mission to connect people to a registered dietitian best suited for their needs. BC Dietitians offer online consultations and provide evidence-based care on a wide range of nutrition matters such as diabetes, weight management, food allergies, eating disorders, and intuitive eating.
    Find BC Dietitians
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    Expert Answer

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    Eating regularly will also help you gain weight. Start by eating something small within 2 hours of waking up, then try to have small meals and snacks every 2-3 hours.
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References

  1. ↑ http://www.nlm.nih.gov/medlineplus/ency/article/002324.htm
  2. ↑ http://www.cancer.org/cancer/news/expertvoices/post/2012/01/24/weight-loss-during-chemo.aspx
  3. ↑ http://www.cancercare.org/publications/24-understanding_and_managing_chemotherapy_side_effects#!chemotherapy-induced-nausea-and-vomiting-cinv
  4. ↑ http://www.cancercare.org/publications/24-understanding_and_managing_chemotherapy_side_effects#!chemotherapy-induced-nausea-and-vomiting-cinv
  5. ↑ http://www.cancer.org/treatment/survivorshipduringandaftertreatment/stayingactive/physical-activity-and-the-cancer-patient
  6. ↑ http://www.cancer.org/treatment/survivorshipduringandaftertreatment/stayingactive/physical-activity-and-the-cancer-patient
  7. ↑ http://www.cancer.org/treatment/survivorshipduringandaftertreatment/nutritionforpeoplewithcancer/nutrition-and-physical-activity-during-and-after-cancer-treatment-answers-to-common-questions
  8. ↑ http://www.cancer.org/treatment/survivorshipduringandaftertreatment/nutritionforpeoplewithcancer/nutrition-and-physical-activity-during-and-after-cancer-treatment-answers-to-common-questions
  9. ↑ http://www.cancer.org/acs/groups/cid/documents/webcontent/002903-pdf.pdf
  1. ↑ https://www.drugs.com/mtm/oxandrolone.html
  2. ↑ http://www.cancercare.org/publications/140-coping_with_cancer-related_weight_changes_and_muscle_loss
  3. ↑ http://www.nlm.nih.gov/medlineplus/ency/article/002324.htm
  4. ↑ Find BC Dietitians. Registered Dietitians Group. Expert Interview. 22 October 2020.
  5. ↑ http://www.cancer.gov/publications/patient-education/eatinghints.pdf
  6. ↑ http://www.cancer.org/treatment/survivorshipduringandaftertreatment/nutritionforpeoplewithcancer/nutritionforthepersonwithcancer/nutrition-during-treatment-recipes
  7. ↑ http://www.cancer.org/acs/groups/cid/documents/webcontent/002903-pdf.pdf
  8. ↑ http://www.sciencedaily.com/releases/2011/02/110228090202.htm
  9. ↑ http://www.nlm.nih.gov/medlineplus/ency/article/002324.htm
  10. ↑ http://www.cancer.net/navigating-cancer-care/how-cancer-treated/chemotherapy/side-effects-chemotherapy
  11. ↑ http://www.cancer.org/acs/groups/cid/documents/webcontent/002903-pdf.pdf
  12. ↑ http://www.cancer.org/cancer/news/expertvoices/post/2012/01/24/weight-loss-during-chemo.aspx
  13. ↑ http://www.cancer.org/treatment/treatmentsandsideeffects/treatmenttypes/chemotherapy/understandingchemotherapyaguideforpatientsandfamilies/understanding-chemotherapy-chemo-side-effects
  14. ↑ http://www.cancer.org/cancer/news/expertvoices/post/2012/01/24/weight-loss-during-chemo.aspx
  15. ↑ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2409471/
  16. ↑ http://www.mayoclinic.org/diseases-conditions/cancer/in-depth/cancer/art-20047536?pg=2
  17. ↑ http://www.cancer.org/acs/groups/cid/documents/webcontent/002903-pdf.pdf

About This Article

Find BC Dietitians
Co-authored by:
Find BC Dietitians
Registered Dietitians Group
This article was co-authored by Find BC Dietitians. Find BC Dietitians is a central hub of qualified nutrition experts in British Columbia, Canada with a mission to connect people to a registered dietitian best suited for their needs. BC Dietitians offer online consultations and provide evidence-based care on a wide range of nutrition matters such as diabetes, weight management, food allergies, eating disorders, and intuitive eating. This article has been viewed 50,359 times.
6 votes - 100%
Co-authors: 10
Updated: October 29, 2022
Views: 50,359
Categories: Cancer

Medical Disclaimer

The content of this article is not intended to be a substitute for professional medical advice, examination, diagnosis, or treatment. You should always contact your doctor or other qualified healthcare professional before starting, changing, or stopping any kind of health treatment.

Article SummaryX

You'll likely feel tired during chemotherapy treatment, so have plenty of your favorite pre-cooked foods and snacks prepared and ready to eat to help you gain weight. Rather than eat a few large meals each day, which can lead to feeling nauseous, eat smaller meals every few hours. Another way to help increase your appetite is to drink most of your fluids between meals or snacks to avoid filling up on them. If solid foods aren't appetizing, replace them with liquid foods, like protein-fortified milk, protein smoothies, soups, or high-protein milkshakes. You can also ask your doctor about prescription medications to help reduce your weight loss and prevent muscle loss. For more tips from our Medical co-author, including how to use fish oil to supplement your diet, keep reading!

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