Eating well during treatment

Simple ways to get the nutrition you need when treatment changes your appetite or how food tastes.

Rosa: Hi, I'm Rosa. Treatment can change your appetite and how food tastes. Let's look at simple ways to keep eating well, one meal at a time.

Good nutrition helps your body heal, keep up strength, and handle treatment. During treatment, the goal is often enough calories and protein. That may mean eating differently than usual.

Try small meals or snacks every few hours instead of three big meals. Include protein, like eggs, yogurt, beans, fish, chicken, nut butters, or shakes. Drink plenty of fluids unless your care team tells you otherwise.

Food safety matters more when your immune system is weak. Wash hands and produce, and cook meat and eggs fully. Avoid raw fish, unpasteurized milk, and food left out too long.

Tell your care team about every vitamin, herb, and supplement you take. Some can change how cancer drugs work. Grapefruit can also affect some medicines.

Be careful with diets that claim to cure or starve cancer. There is no proof they work, and some can cause weight loss that makes treatment harder. Ask to see a registered dietitian who works with people with cancer.

Treatment can cause side effects that make eating hard. These may include nausea, mouth sores, changes in taste, trouble swallowing, constipation, or diarrhea. They are common, and you are not alone. Your care team has ways to help, so tell them early. You do not have to wait for your next visit.

Some days you may not feel like eating at all. That is okay. Do the best you can. Eat the foods that sound good, and eat more when you feel hungry. Many people find that their appetite is better at certain times of day. Use those times to have a bigger meal or a snack with protein.

Your care team may check your weight at visits. Losing weight without trying can make treatment harder, so it is worth talking about. Every person's needs are different. Ask your team or dietitian what is right for you.

If you are a family member or friend, you can help in simple ways. You can shop, cook, or freeze meals ahead of time. Offer food without pressure. Never make someone feel guilty for not eating. Your kindness and company matter just as much as the meal.

Set small goals

Aim for one more sip, one more bite, or one extra snack. Keep easy foods close by, like crackers, cheese, fruit, or yogurt. Small steps add up over the day.

Ease taste changes

If food tastes like metal, try plastic forks and spoons. Cold or room temperature foods often smell less strong. Rinsing your mouth before you eat may help. Try new seasonings, but skip tart foods if your mouth is sore.

Calm an upset stomach

Eat slowly and take small bites. Try bland foods like toast, rice, or bananas. Stay away from strong smells and greasy foods. Ask your care team about medicine for nausea. It works best when you take it as directed.

Who can help

A registered dietitian can build a food plan for you. A social worker can help you find support and programs for food or meals. A palliative care team can help with symptoms like nausea or poor appetite at any stage of illness. A financial navigator can help with costs, such as groceries and nutrition drinks.

When to call your care team

Call if you cannot keep fluids down, or if vomiting or diarrhea will not stop. Call if mouth sores or trouble swallowing keep you from eating or drinking. Call if you are losing weight, feel dizzy, or have very dark urine. Call right away if you have a fever. If you are not sure, it is always okay to call.

Last updated: 2026-10-27. Medically reviewed by Veli Bakalov, MD, medical oncologist (October 2026). General education from Step by Step, the patient portal of HemeOncBuddy.