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Nutrition in Cancer Care (PDQ®)
- Overview of Nutrition in Cancer Care
- Nutrition Therapy in Cancer Care
- Types of Nutrition Care
- Effects of Cancer Treatment on Nutrition
- Treatment of Symptoms
- Nutrition in Advanced Cancer
- Food and Drug Interactions
- Nutrition and Lifestyle in Cancer Survivors
- Nutrition in Cancer Prevention
- To Learn More About Nutrition and Cancer Care
- Current Clinical Trials
- Changes to This Summary (03/06/2013)
- Questions or Comments About This Summary
- Get More Information From NCI
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Overview of Nutrition in Cancer Care
Good nutrition is important for cancer patients.
Nutrition is a process in which food is taken in and used by the body for growth, to keep the body healthy, and to replace tissue. Good nutrition is important for good health. Eating the right kinds of foods before, during, and after cancer treatment can help the patient feel better and stay stronger. A healthy diet includes eating and drinking enough of the foods and liquids that have the important nutrients (vitamins, minerals, protein, carbohydrates, fat, and water) the body needs.
This summary is about nutrition in adults with cancer.
Healthy eating habits are important during cancer treatment.
Nutrition therapy is used to help cancer patients get the nutrients they need to keep up their body weight and strength, keep body tissue healthy, and fight infection. Eating habits that are good for cancer patients can be very different from the usual healthy eating guidelines.
Healthy eating habits and good nutrition can help patients deal with the effects of cancer and its treatment. Some cancer treatments work better when the patient is well nourished and gets enough calories and protein in the diet. Patients who are well nourished may have a better prognosis (chance of recovery) and quality of life.
Cancer can change the way the body uses food.
Some tumors make chemicals that change the way the body uses certain nutrients. The body's use of protein, carbohydrates, and fat may be affected, especially by tumors of the stomach or intestines. A patient may seem to be eating enough, but the body may not be able to absorb all the nutrients from the food.
Cancer and cancer treatments may affect nutrition.
For many patients, the effects of cancer and cancer treatments make it hard to eat well. Cancer treatments that affect nutrition include:
When the head, neck, esophagus, stomach, or intestines are affected by the cancer treatment, it is very hard to take in enough nutrients to stay healthy.
The side effects of cancer and cancer treatment that can affect eating include:
- Anorexia (loss of appetite).
- Mouth sores.
- Dry mouth.
- Trouble swallowing.
Cancer and cancer treatments may affect taste, smell, appetite, and the ability to eat enough food or absorb the nutrients from food. This can cause malnutrition (a condition caused by a lack of key nutrients). Malnutrition can cause the patient to be weak, tired, and unable to fight infections or get through cancer treatment. Malnutrition may be made worse if the cancer grows or spreads. Eating too little protein and calories is a very common problem for cancer patients. Having enough protein and calories is important for healing, fighting infection, and having enough energy.
Anorexia and cachexia are common causes of malnutrition in cancer patients.
Anorexia (the loss of appetite or desire to eat) is a common symptom in people with cancer. Anorexia may occur early in the disease or later, if the cancer grows or spreads. Some patients already have anorexia when they are diagnosed with cancer. Almost all patients who have advanced cancer will have anorexia. Anorexia is the most common cause of malnutrition in cancer patients.
Cachexia is a condition marked by a loss of appetite, weight loss, muscle loss, and general weakness. It is common in patients with tumors of the lung, pancreas, and upper gastrointestinal tract. It is important to watch for and treat cachexia early in cancer treatment because it is hard to correct.
Cancer patients may have anorexia and cachexia at the same time. Weight loss can be caused by eating fewer calories, using more calories, or both.
It is important to treat weight loss caused by cancer and its treatment.
It is important that cancer symptoms and side effects that affect eating and cause weight loss are treated early. Both nutrition therapy and medicine can help the patient stay at a healthy weight. Medicine may be used for the following:
- To help increase appetite.
- To help digest food.
- To help the muscles of the stomach and intestines contract (to keep food moving along).
- To prevent or treat nausea and vomiting.
- To prevent or treat diarrhea.
- To prevent or treat constipation.
- To prevent and treat mouth problems (such as dry mouth, infection, pain, and sores).
- To prevent and treat pain.
See the Nutrition Therapy in Cancer Care section and the Treatment of Symptoms section for more information.
Nutrition Therapy in Cancer Care
Screening and assessment are done before cancer treatment begins, and assessment continues during treatment.
Screening and assessment may include questions about the following:
- Weight changes over the past year.
- Changes in the amount and type of food eaten compared to what is usual for the patient.
- Problems that have affected eating, such as loss of appetite, nausea, vomiting, diarrhea, constipation, mouth sores, dry mouth, changes in taste and smell, or pain.
- Ability to walk and do other activities of daily living (dressing, getting into or out of a bed or chair, taking a bath or shower, and using the toilet).
Finding and treating nutrition problems early may improve the patient's prognosis (chance of recovery).
Early nutrition screening and assessment help find problems that may affect how well the patient's body can deal with the effects of cancer treatment. Patients who are underweight or malnourished may not be able to get through treatment as well as a well-nourished patient. Finding and treating nutrition problems early can help the patient gain weight or prevent weight loss, decrease problems with the treatment, and help recovery.
A healthcare team of nutrition specialists will continue to watch for nutrition problems.
A nutrition support team will check the patient's nutritional health often during cancer treatment and recovery. The team may include the following specialists:
A patient whose religion doesn't allow eating certain foods may want to talk with a religious advisor about allowing those foods during cancer treatment and recovery.
There are three main goals of nutrition therapy for cancer patients in active treatment and recovery.
The main goals of nutrition therapy for patients in active treatment and recovery are to provide nutrients that are missing, maintain nutritional health, and prevent problems. The health care team will use nutrition therapy to do the following:
- Prevent or treat nutrition problems, including preventing muscle and bone loss.
- Decrease side effects of cancer treatment and problems that affect nutrition.
- Keep up the patient's strength and energy.
- Help the immune system fight infection.
- Help the body recover and heal.
- Keep up or improve the patient's quality of life.
The goal of nutrition therapy for patients who have advanced cancer is to help with the patient's quality of life.
The goals of nutrition therapy for patients who have advanced cancer include the following:
- Control side effects.
- Lower the risk of infection.
- Keep up strength and energy.
- Improve or maintain quality of life.
See the Nutrition in Advanced Cancer section for more information.
Types of Nutrition Care
Nutrition support gives nutrition to patients who cannot eat or digest normally.
It is best to take in food by mouth whenever possible. Some patients may not be able to take in enough food by mouth because of problems from cancer or cancer treatment. Medicine to increase appetite may be used.
Nutrition support for patients who cannot eat can be given in different ways.
A patient who is not able to take in enough food by mouth may be fed using enteral nutrition (through a tube inserted into the stomach or intestines) or parenteral nutrition (infused into the bloodstream). The nutrients are given in liquid formulas that have water, protein, fats, carbohydrates, vitamins, and/or minerals.
Nutrition support can improve a patient's quality of life during cancer treatment, but there are harms that should be considered before making the decision to use it. The patient and health care providers should discuss the harms and benefits of each type of nutrition support. (See the Nutrition in Advanced Cancer section below for more information on deciding whether to use nutrition support.)
Enteral nutrition is also called tube feeding.
Enteral nutrition is giving the patient nutrients in liquid form (formula) through a tube that is placed into the stomach or small intestine. The following types of feeding tubes may be used:
- A nasogastric tube is inserted through the nose and down the throat into the stomach or small intestine. This kind of tube is used when enteral nutrition is only needed for a few weeks.
- A gastrostomy tube is inserted into the stomach or a jejunostomy tube is inserted into the small intestine through an opening made on the outside of the abdomen. This kind of tube is usually used for long-term enteral feeding or for patients who cannot use a tube in the nose and throat.
The type of formula used is based on the specific needs of the patient. There are formulas for patients who have special health conditions, such as diabetes. Formula may be given through the tube as a constant drip (continuous feeding) or 1 to 2 cups of formula can be given 3 to 6 times a day (bolus feeding).
Enteral nutrition is sometimes used when the patient is able to eat small amounts by mouth, but cannot eat enough for health. Nutrients given through a tube feeding add the calories and nutrients needed for health.
Enteral nutrition may continue after the patient leaves the hospital.
If enteral nutrition is to be part of the patient's care after leaving the hospital, the patient and caregiver will be trained to do the nutrition support care at home.
Parenteral nutrition carries nutrients directly into the blood stream.
Parenteral nutrition is used when the patient cannot take food by mouth or by enteral feeding. Parenteral feeding does not use the stomach or intestines to digest food. Nutrients are given to the patient directly into the blood, through a catheter (thin tube) inserted into a vein. These nutrients include proteins, fats, vitamins, and minerals.
Parenteral nutrition is used only in patients who need nutrition support for five days or more.
The catheter may be placed into a vein in the chest or in the arm.
A central venous catheter is placed beneath the skin and into a large vein in the upper chest. The catheter is put in place by a surgeon. This type of catheter is used for long-term parenteral feeding.
A peripheral venous catheter is placed into a vein in the arm. A peripheral venous catheter is put in place by trained medical staff. This type of catheter is usually used for short-term parenteral feeding.
The patient is checked often for infection or bleeding at the place where the catheter enters the body.
Parenteral nutrition support may continue after the patient leaves the hospital.
If parenteral nutrition is to be part of the patient's care after leaving the hospital, the patient and caregiver will be trained to do the nutrition support care at home.
Ending parenteral nutrition support must be done under medical supervision.
Going off parenteral nutrition support needs to be done slowly and is supervised by a medical team. The parenteral feedings are decreased by small amounts over time until they can be stopped, or as the patient is changed over to enteral or oral feeding.
Effects of Cancer Treatment on Nutrition
Surgery and Nutrition
Surgery increases the body's need for nutrients and energy.
The body needs extra energy and nutrients to heal wounds, fight infection, and recover from surgery. If the patient is malnourished before surgery, it may cause problems during recovery, such as poor healing or infection. For these patients, nutrition care may begin before surgery.
Surgery to the head, neck, esophagus, stomach, or intestines may affect nutrition.
More than half of cancer patients are treated with surgery. Surgery that removes all or part of certain organs can affect a patient's ability to eat and digest food. The following are nutrition problems caused by specific types of surgery:
- Surgery to the head and neck may cause problems with:Chewing. Swallowing.Tasting or smelling food.Making saliva.Seeing.
- Surgery that affects the esophagus, stomach, or intestines may keep these organs from working as they should to digest food and absorb nutrients.
Nutrition therapy can help relieve nutrition problems caused by surgery.
- Nutritional supplement drinks.
- Enteral nutrition (feeding liquid through a tube into the stomach or intestines).
- Parenteral nutrition (feeding through a catheter into the bloodstream).
- Medicines to increase appetite.
It is common for patients to have pain, tiredness, and/or loss of appetite after surgery. For a short time, some patients may not be able to eat what they usually do because of these symptoms. Following certain tips about food may help. These include:
- Stay away from carbonated drinks (such as sodas) and foods that cause gas, such as:Beans.Peas.Broccoli.Cabbage.Brussels sprouts.Green peppers.Radishes.Cucumbers.
- Increase calories by frying foods and using gravies, mayonnaise, and salad dressings. Supplements high in calories and protein can also be used.
- Choose high-protein and high-calorie foods to increase energy and help wounds heal. Good choices include:Eggs.Cheese.Whole milk.Ice cream.Nuts.Peanut butter.Meat.Poultry.Fish.
- If constipation is a problem, increase fiber by small amounts and drink lots of water. Good sources of fiber include:Whole-grain cereals (such as oatmeal and bran).Beans.Vegetables.Fruit.Whole-grain breads. See the Constipation section for more information.
Chemotherapy and Nutrition
Chemotherapy affects cells all through the body.
Chemotherapy affects fast-growing cells and is used to treat cancer because cancer cells grow and divide quickly. Healthy cells that normally grow and divide quickly may also be killed. These include cells in the mouth, digestive tract, and hair follicles.
Chemotherapy may affect nutrition.
Chemotherapy may cause side effects that cause problems with eating and digestion. When more than one anticancer drug is given, more side effects may occur or they may be more severe. The following side effects are common:
- Loss of appetite.
- Inflammation and sores in the mouth.
- Changes in the way food tastes.
- Feeling full after only a small amount of food.
- Constipation. (See the Constipation section for more information.)
Nutrition therapy can help relieve nutrition problems caused by chemotherapy.
Patients who have side effects from chemotherapy may not be able to eat normally and get all the nutrients they need to restore healthy blood counts between treatments. Nutrition therapy can help relieve these side effects, help patients recover from chemotherapy, prevent delays in treatment, prevent weight loss, and maintain general health. Nutrition therapy may include the following:
- Nutrition supplement drinks between meals.
- Enteral nutrition (tube feedings).
- Changes in the diet, such as eating small meals throughout the day.
Radiation Therapy and Nutrition
Radiation therapy can affect cancer cells and healthy cells in the treatment area.
Radiation therapy can kill cancer cells and healthy cells in the treatment area. The amount of damage depends on the following:
Radiation therapy may affect nutrition.
Radiation therapy to any part of the digestive system often has side effects that cause nutrition problems. Most of the side effects begin a few weeks after radiation therapy begins and go away a few weeks after it is finished. Some side effects can continue for months or years after treatment ends.
The following are some of the more common side effects:
- For radiation therapy to the head and neck Loss of appetite.Changes in the way food tastes.Pain when swallowing.Dry mouth or thick saliva.Sore mouth and gums.Narrowing of the upper esophagus, which can cause choking, breathing, and swallowing problems.
- For radiation therapy to the chestInfection of the esophagus.Trouble swallowing.Esophageal reflux (a backward flow of the stomach contents into the esophagus).
- For radiation therapy to the abdomen or pelvisDiarrhea.Nausea.Vomiting.Inflamed intestines or rectum.A decrease in the amount of nutrients absorbed by the intestines.
Radiation therapy may also cause tiredness, which can lead to a decrease in appetite.
Nutrition therapy can help relieve the nutrition problems caused by radiation therapy.
Nutrition therapy during radiation treatment can help the patient get enough protein and calories to get through treatment, prevent weight loss, help wound and skin healing, and maintain general health. Nutrition therapy may include the following:
- Nutritional supplement drinks between meals.
- Enteral nutrition (tube feedings).
- Changes in the diet, such as eating small meals throughout the day.
See the Stem Cell Transplant and Nutrition section for more information.
Biologic Therapy and Nutrition
Biologic therapy may affect nutrition.
- Loss of appetite.
- Weight gain.
Nutrition therapy can help relieve nutrition problems caused by biologic therapy.
The side effects of biologic therapy can cause weight loss and malnutrition if they are not treated. Nutrition therapy can help patients receiving biologic therapy get the nutrients they need to get through treatment, prevent weight loss, and maintain general health.
Stem Cell Transplant and Nutrition
Stem cell transplant patients have special nutrition needs.
Chemotherapy, radiation therapy, and medicines used for a stem cell transplant may cause side effects that keep a patient from eating and digesting food as usual. Common side effects include the following:
- Changes in the way food tastes.
- Dry mouth or thick saliva.
- Mouth and throat sores.
- Weight loss and loss of appetite.
- Weight gain.
Nutrition therapy is very important for patients who have a stem cell transplant.
Transplant patients have a very high risk of infection. High doses of chemotherapy or radiation therapy decrease the number of white blood cells, which fight infection. It is especially important that transplant patients avoid getting infections.
Patients who have a transplant need plenty of protein and calories to get through and recover from the treatment, prevent weight loss, fight infection, and maintain general health. It is also important to avoid infection from bacteria in food. Nutrition therapy during transplant treatment may include the following:
- A diet of cooked and processed foods only, because raw vegetables and fresh fruit may carry harmful bacteria.
- Guidelines on safe food handling.
- A specific diet based on the type of transplant and the part of the body affected by cancer.
- Parenteral nutrition (feeding through the bloodstream) during the first few weeks after the transplant, to give the patient the calories, protein, vitamins, minerals, and fluids they need to recover.
See the Low White Blood Cell Counts and Infections section for more information.
Treatment of Symptoms
When side effects of cancer or cancer treatment affect normal eating, changes can be made to help the patient get the nutrients needed. Medicines may be given to increase appetite. Eating foods that are high in calories, protein, vitamins, and minerals is usually best. Meals should be planned to meet the patient's nutrition needs and tastes in food. The following are some of the more common symptoms caused by cancer and cancer treatment and ways to treat or control them.
Anorexia (the loss of appetite or desire to eat) is one of the most common problems for cancer patients. Eating in a calm, comfortable place and getting regular exercise may improve appetite. The following may help cancer patients who have a loss of appetite:
- Eat small high-protein and high-calorie meals every 1-2 hours instead of three large meals. The following are high-calorie, high-protein food choices: Cheese and crackers. Muffins. Puddings. Nutritional supplements. Milkshakes. Yogurt. Ice cream. Powdered milk added to foods such as pudding, milkshakes, or any recipe using milk. Finger foods (handy for snacking) such as deviled eggs, deviled ham on crackers, or cream cheese or peanut butter on crackers or celery.Chocolate.
- Add extra calories and protein to food by using butter, skim milk powder, honey, or brown sugar.
- Drink liquid supplements (special drinks that have nutrients), soups, milk, juices, shakes, and smoothies, if eating solid food is a problem.
- Eat breakfasts that have one third of the calories and protein needed for the day.
- Eat snacks that have plenty of calories and protein.
- Eat foods that smell good. Strong odors can be avoided in the following ways:Use boiling bags or microwave steaming bags.Cook outdoors on the grill.Use a kitchen fan when cooking.Serve cold food instead of hot (since odors are in the rising steam).Take off any food covers to release the odors before going into a patient's room.Use a small fan to blow food odors away from patients.Order take-out food.
- Try new foods and new recipes, flavorings, spices, and foods with a different texture or thickness. Food likes and dislikes may change from day to day.
- Plan menus ahead of time and get help preparing meals.
- Make and store small amounts of favorite foods so they are ready to eat when hungry.
See the NCI Web site for Eating Hints: Before, During, and After Cancer Treatment, which has recipes such as Lactose-Free Double Chocolate Pudding, Banana Milkshake, and Fruit and Cream. For a free copy of this booklet, call the Cancer Information Service at 1-800-4-CANCER (1-800-422-6237).
Changes in how foods taste may be caused by radiation treatment, dental problems, mouth sores and infections, or some medicines. Many cancer patients who receive chemotherapy notice a bitter taste or other changes in their sense of taste. A sudden dislike for certain foods may occur. This can cause a loss of appetite, weight loss, and a decreased quality of life. Some or all of a normal sense of taste may return, but it may take up to a year after treatment ends. The following may help cancer patients who have taste changes:
- Eat small meals and healthy snacks several times a day.
- Eat meals when hungry rather than at set mealtimes.
- Eat favorite foods and try new foods when feeling best.
- Eat poultry, fish, eggs, and cheese instead of red meat.
- Eat citrus fruits (oranges, tangerines, lemons, grapefruit) unless mouth sores are present.
- Add spices and sauces to foods.
- Eat meat with something sweet, such as cranberry sauce, jelly, or applesauce.
- Find nonmeat, high-protein recipes in a vegetarian or Chinese cookbook.
- Use sugar-free lemon drops, gum, or mints if there is a metallic or bitter taste in the mouth.
- Rinse mouth with water before eating.
- Eat with family and friends.
- Have others prepare the meal.
- Use plastic utensils if foods have a metal taste.
Dry mouth is often caused by radiation therapy to the head and neck and by certain medicines. Dry mouth may affect speech, taste, and the ability to swallow or to use dentures or braces. There is also an increased risk of cavities and gum disease because less saliva is made to wash the teeth and gums.
The main treatment for dry mouth is drinking plenty of liquids. Other ways to help relieve dry mouth include the following:
- Keep water handy at all times to moisten the mouth.
- Eat moist foods with extra sauces, gravies, butter, or margarine.
- Eat foods and drinks that are very sweet or tart (to increase saliva).
- Eat ice chips or frozen desserts (such as frozen grapes and ice pops).
- Drink fruit nectar instead of juice.
- Suck on hard candy or chew gum.
- Use a straw to drink liquids.
- Clean teeth (including dentures) and rinse mouth at least four times a day (after eating and at bedtime). Don't use mouth rinses that contain alcohol.
See the Dry Mouth section of the PDQ summary on Oral Complications of Chemotherapy and Head/Neck Radiation for more information.
Mouth Sores and Infections
Mouth sores can be caused by chemotherapy and radiation therapy. These treatments affect fast-growing cells, such as cancer cells. Normal cells inside the mouth also grow quickly and may be damaged by these cancer treatments. Mouth sores can be painful and become infected or bleed and make it hard to eat. By choosing certain foods and taking good care of their mouths, patients can usually make eating easier. The following can help patients who have mouth sores and infections:
- Eat soft foods that are easy to chew and swallow, such as the following: Soft fruits, including bananas, applesauce, and watermelon. Peach, pear, and apricot nectars. Cottage cheese. Mashed potatoes. Macaroni and cheese. Custards and puddings. Gelatin. Milkshakes. Scrambled eggs. Oatmeal or other cooked cereals.
- Stay away from the following:Citrus fruits and juices, (such as oranges, tangerines, lemons, and grapefruit). Spicy or salty foods.Rough, coarse, or dry foods, including raw vegetables, granola, toast, and crackers.
- Use a blender to make vegetables (such as potatoes, peas, and carrots) and meats smooth.
- Add gravy, broth, or sauces to food.
- Drink high-calorie, high-protein drinks in addition to meals.
- Cook foods until soft and tender.
- Eat foods cold or at room temperature. Hot and warm foods can irritate a tender mouth.
- Cut foods into small pieces.
- Use a straw to drink liquids.
- Numb the mouth with ice chips or flavored ice pops before eating.
- Clean teeth (including dentures) and rinse mouth at least four times a day (after eating and at bedtime).
See the Oral Mucositis and Infection sections of the PDQ summary on Oral Complications of Chemotherapy and Head/Neck Radiation for more information on mouth sores and infections.
Nausea caused by cancer treatment can affect the amount and kinds of food eaten. The following may help cancer patients control nausea:
- Eat before cancer treatments.
- Rinse out the mouth before and after eating.
- Eat foods that are bland, soft, and easy-to-digest, rather than heavy meals. Eat small meals several times a day.
- Eat dry foods such as crackers, bread sticks, or toast throughout the day.
- Slowly sip fluids throughout the day.
- Suck on hard candies such as peppermints or lemon drops if the mouth has a bad taste.
- Stay away from foods that are likely to cause nausea. For some patients, this includes spicy foods, greasy foods, and foods that have strong odors.
- Sit up or lie with the upper body raised for one hour after eating.
- Don't eat in a room that has cooking odors or that is very warm. Keep the living space at a comfortable temperature with plenty of fresh air.
See the PDQ summary on Nausea and Vomiting for more information.
Diarrhea may be caused by cancer treatments, surgery on the stomach or intestines, or by emotional stress. Long-term diarrhea may lead to dehydration (lack of water in the body) or low levels of salt and potassium, which are important minerals needed by the body.
The following may help cancer patients control diarrhea:
- Eat broth, soups, bananas, and canned fruits to help replace salt and potassium lost by diarrhea. Sports drinks can also help.
- Drink plenty of fluids during the day. Liquids at room temperature may cause fewer problems than hot or cold liquids.
- Drink at least one cup of liquid after each loose bowel movement.
- Stay away from the following:Greasy foods, hot or cold liquids, or caffeine.High-fiber foods—especially dried beans and cruciferous vegetables (such as broccoli, cauliflower, and cabbage). Milk and milk products, until the cause of the diarrhea is known. Foods and beverages that cause gas (such as peas, lentils, cruciferous vegetables, chewing gum, and soda). Sugar-free candies or gum made with sorbitol (sugar alcohol).
See the Dehydration (Lack of Fluid) section for more information.
Low White Blood Cell Counts and Infections
A low white blood cell count may be caused by radiation therapy, chemotherapy, or the cancer itself. Patients who have a low white blood cell count have an increased risk of infection. The following may help cancer patients prevent infections when white blood cell counts are low:
- Stay away from:Raw eggs or raw fish.Old, moldy, or damaged fruits and vegetables. Food sold in open bins or containers. Salad bars and buffets when eating out.
- Wash hands often to prevent the spread of bacteria.
- Thaw foods in the refrigerator or microwave. Never thaw foods at room temperature. Cook foods immediately after thawing.
- Keep hot foods hot and cold foods cold.
- Cook all meat, poultry, and fish until well done.
- Refrigerate all leftovers within 2 hours of cooking and eat them within 24 hours.
- Buy foods packed as single servings, to avoid leftovers.
- Do not buy or eat food that is out of date.
- Do not buy or eat food in cans that are swollen, dented, or damaged.
Dehydration (Lack of Fluid)
The body needs plenty of water to replace the fluids lost every day. Nausea, vomiting, and pain may keep the patient from drinking and eating enough to get the amount of water the body needs. Long-term diarrhea causes a loss of fluid from the body. One of the first signs of dehydration (lack of water in the body) is feeling very tired. The following may help cancer patients prevent dehydration:
- Drink 8 to 12 cups of liquids a day. This can be water, juice, milk, or foods that have a lot of liquid in them, such as ice pops, flavored ices, and gelatins.
- Stay away from drinks that have caffeine in them, such as sodas, coffee, and tea (both hot and cold).
- Take a water bottle whenever leaving home. It is important to drink even if not thirsty.
- Drink most liquids between meals.
- Use medicines that help prevent and treat nausea and vomiting.
It is very common for cancer patients to have constipation (fewer than three bowel movements a week). Constipation may be caused by the following:
- Too little water or fiber in the diet.
- Not being active.
- Cancer treatment, such as chemotherapy.
- Certain medicines used to treat the side effects of chemotherapy, such as nausea and pain.
Preventing and treating constipation is a part of cancer care.
To prevent constipation:
- Eat more fiber-containing foods. Twenty-five to 35 grams of fiber a day is best. Food labels show the amount of fiber in a serving. (Some sources of fiber are listed below.) Add a little more fiber each day and drink plenty of fluids at the same time to keep the fiber moving through the intestines.
- Drink 8 to 12 cups of fluid each day. Water, prune juice, warm juices, lemonade, and teas without caffeine can be very helpful.
- Take walks and exercise regularly. Wear shoes made for exercise.
To treat constipation:
- Continue to eat high-fiber foods and drink plenty of fluids. Try adding wheat bran to the diet; begin with 2 heaping tablespoons each day for 3 days, then increase by 1 tablespoon each day until constipation is relieved. Do not take more than 6 tablespoons a day.
- Stay physically active.
- Use over-the-counter constipation treatments, if needed. These include:Bulk-forming products (such as Citrucel, Metamucil, Fiberall, and Fiber-Lax).Stimulants (such as Dulcolax and Senokot).Stool softeners (such as Colace and Surfak).Osmotics (such as milk of magnesia).
- Cottonseed and aerosol enemas can also help. Do not use lubricants such as mineral oil because they may keep the body from using important nutrients the way it should.
Good food sources of fiber include the following:
- Legumes (beans and lentils).
- Cold cereals (whole grain or bran).
- Hot cereals.
- Whole-grain breads.
See the Constipation section of the PDQ summary on Gastrointestinal Complications for more information.
Nutrition in Advanced Cancer
Palliative care helps relieve symptoms that bother the patient and helps improve the patient's quality of life.
The goal of palliative care is to improve the quality of life of patients who have a serious or life-threatening disease. Palliative care is meant to prevent or treat symptoms, side effects, and psychological, social, and spiritual problems caused by a disease or its treatment.
Nutrition needs are different for patients with advanced cancer.
It is common for patients with advanced cancer to want less food. Patients usually prefer soft foods and clear liquids. Those who have problems swallowing may do better with thick liquids than with thin liquids. Patients often do not feel much hunger at all and may need very little food.
In patients with advanced cancer, most foods are allowed. During this time, eating can be focused on pleasure rather than getting enough nutrients. Patients usually cannot eat enough of any food that might cause a problem. However, some patients may need to stay on a special diet. For example, patients with cancer that affects the abdomen may need a soft diet to keep the bowel from getting blocked.
The benefits and harms of nutrition support are different for each patient.
Answering the following questions may help to make decisions about using nutrition support:
- What are the wishes and needs of the patient and family?
- Will the patient's quality of life be improved?
- Do the possible benefits outweigh the risks and costs?
- Is there an advance directive? An advance directive is a legal document that states the treatment or care a person wishes to receive or not receive if he or she becomes unable to make medical decisions. One type of advance directive is a living will.
Cancer patients and their caregivers have the right to make informed decisions. The healthcare team and a registered dietitian can explain the benefits and risks of using nutrition support for patients with advanced cancer. In most cases, there are more harms than benefits, especially with parenteral nutrition support. However, for someone who still has good quality of life but is unable to get enough food and water by mouth, enteral feedings may be best. The benefits and risks of enteral nutrition during advanced cancer include the following:
- May make the patient more alert.
- May be a comfort to the family.
- May relieve nausea.
- May make the patient feel more hopeful.
- Surgery may be needed to place a tube through the abdomen.
- May increase the amount of saliva in the mouth and throat. This may cause choking or pneumonia.
- May cause diarrhea or constipation.
- May cause nausea.
- May cause infection.
- Makes patient care harder for caregiver.
Food and Drug Interactions
Some foods do not mix safely with certain drugs.
Cancer patients may be treated with a number of drugs. Taking certain foods and drugs together may decrease or change how well the drugs work or cause life-threatening side effects. The following table lists some of the food and drug interactions that may occur with certain anticancer drugs:Drug-Food Interactions Brand NameGeneric NameFood InteractionsTargretinBexaroteneGrapefruit juice may increase the drug's effects. FolexMethotrexateAlcohol may cause liver damage.RheumatrexMithracinPlicamycinSupplements of calcium and vitamin D may decrease the drug's effect.MatulaneProcarbazineAlcohol may cause headache, trouble breathing, flushed skin, nausea, or vomiting, Caffeine may raise blood pressure. TemodarTemozolomideFood may slow or decrease the drug's effect.
Talk with your doctor about possible food and drug interactions.
Some herbal supplements do not mix safely with certain drugs or foods.
Taking some herbal supplements with certain foods and drugs may change how well cancer treatment works or cause life-threatening side effects. Talk with your doctor about how herbal supplements may affect your cancer treatment.
Nutrition and Lifestyle in Cancer Survivors
Cancer survivors have special nutrition needs.
Everyone needs a healthy diet and exercise for good health and to help prevent disease. Cancer survivors have special health needs, especially because of the risks of late effects and the cancer coming back. Studies have shown that a healthy diet helps to prevent late effects such as obesity, heart disease, and metabolic syndrome. Researchers are also studying whether certain diet and exercise habits in cancer survivors can keep cancer from coming back or keep new cancers from forming.
Healthy diet and lifestyle habits can improve the quality of life for cancer survivors.
Surveys show that many cancer survivors do not follow cancer prevention guidelines and have lifestyle behaviors that may increase their risk for late effects or make late effects worse. Education programs can help cancer survivors learn how to make behavior changes that keep them healthier. Programs that cover diet, exercise, and stress management are more likely to help cancer survivors make lasting changes.
The effects of diet and lifestyle on cancer continue to be studied.
Nutrition in Cancer Prevention
Following certain dietary guidelines may help prevent cancer.
The American Cancer Society and the American Institute for Cancer Research both have dietary guidelines that may help prevent cancer. Their guidelines are a lot alike and include the following:
- Eat a plant-based diet, with at least 5 servings of fruit and vegetables a day. Have several servings a day of beans and grain products (such as cereals, breads, and pasta). Eat less meat.
- Eat foods low in fat.
- Eat foods low in salt.
- Get to and stay at a healthy weight.
- Be active for 30 minutes on most days of the week.
- Drink few alcoholic drinks or don't drink at all.
- Prepare and store food safely.
- Do not use tobacco in any form.
The effect of soy on breast cancer and breast cancer prevention is being studied.
Study results include the following:
- Some studies show that eating soy may decrease the risk of having breast cancer.
- Taking soy supplements in the form of powders or pills has not been shown to prevent breast cancer.
- Adding soy foods to the diet after being diagnosed with breast cancer has not been shown to keep the breast cancer from coming back.
Soy has substances in it that act like estrogen in the body. Studies were done to find out how soy affects breast cancer in patients who have tumors that need estrogen to grow. Some studies have shown that soy foods are safe for women with breast cancer when eaten in moderate amounts as part of a healthy diet.
If you are a breast cancer survivor be sure to check the most up-to-date information when deciding whether to include soy in your diet.
To Learn More About Nutrition and Cancer Care
National Cancer Institute
- Cancer Prevention Overview
- Breast Cancer Prevention
- Colorectal Cancer Prevention
- Esophageal Cancer Prevention
- Lung Cancer Prevention
- Stomach (Gastric) Cancer Prevention
For general nutrition information and other resources, see the following:
- American Botanical Council 800-373-7105 abc.herbalgram.org
- American Cancer Society 800-227-2345 www.cancer.org
- American Dietetic Association 800-877-1600 www.eatright.org
- American Institute for Cancer Research 800-843-8114 www.aicr.org
- American Society for Parenteral and Enteral Nutrition 800-727-4567 www.nutritioncare.org
- National Center for Complementary and Alternative Medicine (NCCAM) 888-644-6226 (NCCAM Clearinghouse) 866-464-3615 (toll free TTY)nccam.nih.gov
- Office of Dietary Supplements 301-435-2920 ods.od.nih.gov
- American Cancer Society’s Healthy Eating Cookbook: a Celebration of Food, Friends, and Healthy Living. 3rd ed. Atlanta, GA: The American Cancer Society, 2005.
- Bloch A, Cassileth BR, Holmes MD, Thomson CA, eds.: Eating Well, Staying Well During and After Cancer. Atlanta, GA: American Cancer Society, 2004.
- Ghosh K, Carson L, and Cohen E: Betty Crocker’s Living With Cancer Cookbook: Easy Recipes and Tips Through Treatment and Beyond. New York, NY: Hungry Minds, 2002.
- Weihofen DL, Robbins J, Sullivan PA: Easy-to-Swallow, Easy-to-Chew Cookbook: over 150 Tasty and Nutritious Recipes for People Who Have Difficulty Swallowing. New York, NY: John Wiley & Sons, Inc., 2002.
- Wilson JR: I-Can’t-Chew Cookbook: Delicious Soft-Diet Recipes for People With Chewing, Swallowing, or Dry-Mouth Disorders. Alameda, Calif: Hunter House Inc., 2003.
Current Clinical Trials
Check NCI’s list of cancer clinical trials for U.S. supportive and palliative care trials about malnutrition, nutritional support and nutritional therapy that are now accepting participants. The list of trials can be further narrowed by location, drug, intervention, and other criteria.
General information about clinical trials is also available from the NCI Web site.
Changes to This Summary (03/06/2013)
Editorial changes were made to this summary.
Questions or Comments About This Summary
If you have questions or comments about this summary, please send them to Cancer.gov through the Web site’s Contact Form. We can respond only to email messages written in English.
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PDQ is a comprehensive cancer database available on NCI's Web site.
PDQ is the National Cancer Institute's (NCI's) comprehensive cancer information database. Most of the information contained in PDQ is available online at NCI's Web site. PDQ is provided as a service of the NCI. The NCI is part of the National Institutes of Health, the federal government's focal point for biomedical research.
PDQ contains cancer information summaries.
The PDQ database contains summaries of the latest published information on cancer prevention, detection, genetics, treatment, supportive care, and complementary and alternative medicine. Most summaries are available in two versions. The health professional versions provide detailed information written in technical language. The patient versions are written in easy-to-understand, nontechnical language. Both versions provide current and accurate cancer information.
Images in the PDQ summaries are used with permission of the author(s), artist, and/or publisher for use within the PDQ summaries only. Permission to use images outside the context of PDQ information must be obtained from the owner(s) and cannot be granted by the National Cancer Institute. Information about using the illustrations in the PDQ summaries, along with many other cancer-related images, are available in Visuals Online, a collection of over 2,000 scientific images.
The PDQ cancer information summaries are developed by cancer experts and reviewed regularly.
Editorial Boards made up of experts in oncology and related specialties are responsible for writing and maintaining the cancer information summaries. The summaries are reviewed regularly and changes are made as new information becomes available. The date on each summary ("Date Last Modified") indicates the time of the most recent change.
PDQ also contains information on clinical trials.
A clinical trial is a study to answer a scientific question, such as whether one method of treating symptoms is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. Some patients have symptoms caused by cancer treatment or by the cancer itself. During supportive care clinical trials, information is collected about how well new ways to treat symptoms of cancer work. The trials also study side effects of treatment and problems that come up during or after treatment. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." Patients who have symptoms related to cancer treatment may want to think about taking part in a clinical trial.
Listings of clinical trials are included in PDQ and are available online at NCI's Web site. Descriptions of the trials are available in health professional and patient versions. Many cancer doctors who take part in clinical trials are also listed in PDQ. For more information, call the Cancer Information Service 1-800-4-CANCER (1-800-422-6237).
This information was last updated on 2013-03-06