The best diet during cancer treatment is the one you can actually eat. Your goals are simple: get enough protein and calories to keep your strength up, stay hydrated, and manage side effects so food feels like support — not one more thing to stress about.
There's a lot of fear-based nutrition advice out there for people with cancer. Let's set that down and focus on what helps.
First, a myth worth letting go of
You may have heard that sugar "feeds cancer." Every cell in your body uses glucose, and cutting out carbs or fruit doesn't starve a tumor. What it can do is make it harder to get enough energy when you need it most. If a piece of toast or a smoothie is what sounds good today, that's a win.
Protein is your priority
Treatment is hard on your body, and protein helps you hold on to muscle, heal, and support your immune system. Aim to include some at every meal and snack: eggs, Greek yogurt, cottage cheese, fish, chicken, beans, tofu, nut butters, or a protein shake on days when chewing feels like a lot.
Managing common side effects with food
Nausea: Small meals every two to three hours usually sit better than three big ones. Cold or room-temperature foods smell less, which helps. Ginger tea or chews help some people. Keep crackers by the bed for the morning.
Taste changes: If food tastes metallic, try plastic utensils and bright flavors like lemon, herbs, or a marinade. If everything tastes like nothing, lean into texture and seasoning.
Mouth sores: Go soft and gentle — smoothies, oatmeal, eggs, soups — and skip acidic or spicy foods until they heal.
Fatigue: Stock easy wins for low days: rotisserie chicken, frozen soups, pre-cut fruit, yogurt. Let people bring you meals. That's not giving up — it's good planning.
Digestion: Diarrhea and constipation are both common. Your dietitian can help you adjust fiber and fluids for what's happening that week.
What about supplements?
Talk to your oncology team before starting anything, including "natural" products. Some herbs and high-dose antioxidants can interact with chemotherapy or radiation. A dietitian who works with oncology patients can help you figure out what's useful and what to wait on.
Food safety matters more now
If your white blood cell counts drop, your oncology team may recommend extra food-safety precautions. Follow their guidance — they know your numbers.
How Indigo's dietitians help
Our dietitians support patients through every stage of treatment, from appetite and taste changes to energy and digestion. They build a plan around what you can eat right now, adjust it as treatment changes, and work alongside your oncology team and our acupuncturists so your care connects.
FAQ
Should I go on a special diet during chemo? For most people, no. Focus on enough protein, calories, and fluids, and adjust for side effects.
Is it okay to lose weight during treatment? Unintentional weight loss is worth flagging to your care team, since it can affect strength and recovery.
Can I meet with a dietitian virtually? Yes, we offer virtual sessions, which many patients prefer during treatment.
Want help making food feel easier? Book with our nutrition team in person or virtually.