When you’re healthy, eating enough food to get required nutrition and calories is not usually a problem. Most nutrition guidelines stress on eating lots of vegetables, fruits, and whole-grain products. They also recommend limiting the amount of red meat you eat, especially meats that are processed or high in fat. Cutting back on fat, sugar, alcohol, and salt; and staying at a healthy weight is also recommended. But when someone is being treated for cancer, these things can be hard to do, especially if they have side effects or just don’t feel well. Food for cancer patients needs to carefully decided.
During cancer treatment, you might need to change your diet. Well planned food for cancer patients can help build up strength and withstand the effects of the treatment. This may mean eating things that aren’t normally recommended when in good health. For instance, you might need high-fat, high-calorie foods to keep up the weight, or thick, cool foods like ice cream or milk shakes due to sores in the mouth and throat that make it hard to eat anything. The type of cancer, ongoing treatment, and side-effects of the treatment must be considered when trying to figure out the best ways to get the nutrition your body needs.
The nutrition needs of people with cancer vary from person to person. Your cancer care team can help you identify your nutrition goals and plan ways to help you meet them.
Eating well while you’re being treated for cancer would help you:
1) Feel better
2) Keep up your strength and energy
3) Maintain your weight and your body's store of nutrients
4) Better tolerate treatment related side effects
5) Lower your risk of infections
6) Heal and recover faster
Eating well means eating a variety of foods to get the nutrients your body needs to fight cancer. These nutrients include proteins, fats, carbohydrates, water, vitamins, and minerals.
Carbohydrates are the body’s major source of energy and provide it the fuel needed for physical activity and proper organ function. The best sources of carbohydrates – fruits, vegetables, and whole grains – also supply needed vitamins and minerals, fiber, and phytonutrients to the body’s cells. (Phytonutrients are chemicals in plant-based foods that we don’t need to live, but that might promote health.)
Fibre is the part of plant foods that the body can’t digest. There are 2 types of fiber. Insoluble fiber helps to move food waste out of the body quickly, and soluble fiber binds with water in the stool to help keep stool soft.
Other sources of carbohydrates include bread, potatoes, rice, spaghetti, pasta, cereals, corn, peas, and beans. Sweets (desserts, candy, and drinks with sugar) can supply carbohydrates, but provide very little in the way of vitamins, minerals, or phytonutrients.
We need protein for growth, to repair body tissue, and to keep our immune system healthy. When your body doesn’t get enough protein, it might break down muscle for the fuel it needs. This makes it take longer to recover from illness and can lower resistance to infection. People with cancer often need more protein than usual. After surgery, chemotherapy, or radiation therapy, extra protein is usually needed to heal tissues and help fight infection.
Good sources of protein include fish, poultry, lean red meat, eggs, low-fat dairy products, nuts and nut butters, dried beans, peas and lentils, and soy foods.
You may have heard that some fats are better for you than others. When considering the effects of fats on your heart and cholesterol level, choose monounsaturated (olive, canola, and peanut oils) and polyunsaturated fats (these are found mainly in safflower, sunflower, corn, and flaxseed oils and seafood) more often than saturated fats or trans fats.
Saturated fats are mainly found in animal sources like meat and poultry, whole or reduced-fat milk, cheese, and butter. Some vegetable oils like coconut, palm kernel oil, and palm oil are saturated. Saturated fats can raise cholesterol and increase your risk for heart disease. Less than 10% of your calories should come from saturated fat.
Sources of trans fats include snack foods and baked goods made with partially hydrogenated vegetable oil or vegetable shortening. Trans fats are also found naturally in some animal products, like dairy products. Trans fats can raise bad cholesterol and lower good cholesterol. Avoid trans fats as much as you can.
Water and liquids or fluids are vital to health. All body cells need water to function. If you don’t take in enough fluids or if you lose fluids through vomiting or diarrhoea, you can become dehydrated. If this happens, the fluids and minerals that help keep your body working can become dangerously out of balance. You get water from the foods you eat, but a person should also drink about eight 8-ounce glasses of liquid each day to be sure that all the body cells get the fluid they need. You may need extra fluids if you’re vomiting, have diarrhoea, or even if you’re just not eating much. Keep in mind that all liquids (soups, milk, even ice cream and gelatine) count towards your fluid goals.
Your body needs vitamins and minerals to help it function properly and use the energy (calories) in food. Most are found naturally in foods, but they are also sold as pills and liquid supplements.
If you eat a balanced diet with enough calories and protein you will usually get plenty of vitamins and minerals. But it can be hard to eat a balanced diet when you’re being treated for cancer, especially if you have treatment side effects. If you do have side effects, your doctor or dietitian may suggest a daily multivitamin and mineral supplement. If your food intake has been limited for several weeks or months because of the effects of treatment, be sure to tell your doctor. You might need to be checked for vitamin or mineral deficiencies.
If you’re thinking of taking a supplement, be sure to discuss this with your doctor first. Some people with cancer take large amounts of vitamins, minerals, and other dietary supplements to try to boost their immune system or even destroy cancer cells. But some of these substances can be harmful, especially when taken in large doses. In fact, large doses of some vitamins and minerals may make chemotherapy and radiation therapy less effective.
If your doctor says it’s OK for you to take a vitamin during treatment, it may be best to choose a supplement with no more than 100% of the Daily Value (DV) of vitamins and minerals and one without iron (unless your doctor thinks you need iron).
Antioxidants include vitamins A, C, and E; selenium and zinc; and some enzymes that absorb and attach to free radicals (destructive molecules), preventing them from attacking normal cells.
If you want to take in more antioxidants, health experts recommend eating a variety of fruits and vegetables, which are good sources of antioxidants. Taking large doses of antioxidant supplements or vitamin-enhanced foods or liquids is usually not recommended while getting chemo or radiation therapy. Talk with your doctor to find out the best time to take antioxidant supplements.
Phytonutrients or phytochemicals are plant compounds like carotenoids, lycopene, resveratrol, and phytosterols that are thought to have health-protecting qualities. They’re found in plants such as fruits and vegetables, or things made from plants, like tofu or tea. Phytochemicals are best taken in by eating the foods that contain them rather than taking supplements or pills.
Herbs have been used to treat disease for hundreds of years, with mixed results. Today, herbs are found in many products, like pills, liquid extracts, teas, and ointments. Many of these products are harmless and safe to use, but others can cause harmful side effects. Some may even interfere with proven cancer treatments and recovery from surgery. If you’re interested in using products containing herbs, talk about it with your oncologist or nurse first.
Many people believe that a pill or supplement they find in stores, is safe and it works. The Food and Drug Administration (FDA) has rules to help ensure that supplements contain what their labels claim they do, but the supplement’s safety and its effects on the body are not addressed by any FDA rules. The FDA does not make manufacturers of these products print possible side effects on their labels. And the FDA can’t pull a dietary supplement or herbal product from the market unless they have proof that the product is unsafe.
Tell your cancer care team about any over-the-counter products or supplements you are using or are thinking about using. Take the bottle(s) to your doctor to talk about the dose and be sure that the ingredients do not interfere with your health or cancer treatments.
A few safety tips to follow would be:
1) Ask your cancer care team for reliable information on dietary supplements.
2) Check the product labels for both the quantity and concentration of active ingredients in each product.
3) Stop taking the product and call your cancer care team right away if you have side effects, like wheezing, itching, numbness, or tingling in your limbs.