Medical Oncologist
Eating well on treatment
Diet and Nutrition — While on Rituximab
You do not need a special diet on rituximab. What you need is food that is freshly cooked, handled safely, and gives your body enough protein to stay strong. Most traditional Indian meals already meet that standard.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Food hygiene first — Rituximab lowers your immunity, so bacteria in poorly handled food are a bigger risk than they would normally be.
- Fresh and hot is the rule — Food cooked and eaten the same day, served hot, is safe. Food sitting out for hours carries more risk.
- Your regular meals mostly work — Dal, rice, khichdi, idli — traditional Indian staples are a good fit if freshly prepared at home.
- Protein matters more than you think — Your body repairs itself during treatment. Dal, eggs, and well-cooked meat give it what it needs.
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Rituximab suppresses part of your immune system, which means food hygiene matters more than usual. You do not need a rigid special diet, but food should be freshly cooked, thoroughly heated, and free from raw or uncooked ingredients. Most home-cooked Indian meals are a good fit if prepared and eaten the same day.
Why does rituximab affect what you can safely eat?
Rituximab works by depleting B cells, which are part of your immune system. While your B cells are low, your body is less able to fight bacteria that can enter through food that is handled or stored carelessly.
This does not mean you need a long list of banned foods. It means the hygiene habits that already matter — cooking food through, eating it fresh, washing produce — become more important now.
The risk is from bacteria in raw or undercooked food, not from the food itself. A freshly made plate of chole or a bowl of rasam is not a problem. The same chole left sitting out for six hours is.
What food safety habits should you follow during treatment?
- Cook food fresh and eat it the same day — do not leave cooked rice, dal or sabzi at room temperature for more than two hours.
- Wash all vegetables and fruit thoroughly under running water before cutting or cooking.
- Avoid raw sprouts — moong, methi, or any other variety — even if you normally eat them without any problem.
- Choose packaged, pasteurised milk and dairy. Avoid loose milk from local vendors or unpackaged paneer.
- Drink boiled or filtered water. Avoid ice from uncertain sources.
- Skip raw chutneys — fresh pudina or dhaniya chutney — when your immunity is low. Cook them into a tadka instead.
- Peel and cut fruit yourself at home. Avoid pre-cut fruit from outside.
- Eat eggs fully cooked — avoid half-boiled preparations or anything with a runny yolk.
- Avoid street food and roadside cut fruit throughout the treatment period.
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Which Indian foods give you the most support during treatment?
Khichdi made with moong dal and rice is one of the most practical meals during rituximab treatment. It is easy to digest, gives you carbohydrate and protein together, and is gentle on a stomach that may be unsettled after an infusion.
For protein, moong dal, masoor dal, chana dal, well-cooked eggs, grilled or boiled chicken, and cooked fish are all reliable. If your appetite is low, a small bowl of dal three times a day adds up to meaningful protein without feeling heavy.
For hydration, coconut water from a sealed tin or tetra pack, nimbu pani made at home with boiled water, and warm jeera water all help. Avoid fresh-pressed juices and sugarcane juice from outside stalls.
If rituximab is part of a regimen that includes chemotherapy, nausea in the days after infusion is common. Plain rice with a little ghee, plain dosa without chutney, or a roti with dal are easier to manage than heavy or heavily spiced food during those days.
Did you know?
Rituximab continues to suppress B cells for several months after the final dose — not just during the active weeks of treatment.
The food hygiene advice your team gives you applies throughout this recovery window, not only on infusion days.
Source: ESMO Clinical Practice Guidelines; rituximab prescribing and pharmacokinetic data
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Common questions
Frequently asked questions
Can I eat my usual Indian home food during rituximab?
Yes, and home-cooked Indian food is generally one of the safest options during treatment. Dal, sabzi, rice, roti, idli, dosa, and khichdi are all appropriate if freshly cooked and eaten the same day. The main adjustment is avoiding raw ingredients — raw salads, raw sprouts, raw chutneys — and not eating food that has been left sitting out for hours. If it is freshly made and served hot, most of what you normally cook at home is fine.
Is it safe to eat at restaurants or order food in during treatment?
Restaurant food carries more uncertainty than home cooking because you cannot verify how long the food has been kept or whether hygiene standards are consistent. Well-established sit-down restaurants are lower risk than street food or cut fruit stalls. If you do eat out, choose dishes served hot and freshly made rather than buffet items that have been standing. Ask your oncology team what level of caution they recommend for your specific situation and stage of treatment.
What should I eat if I feel nauseous after the infusion?
Plain, mild food works best on days when nausea is a problem. Khichdi with minimal spice, plain rice with a small amount of ghee, a dry roti, or a plain banana are usually well tolerated. Eat small amounts every two to three hours rather than a full meal. Sipping on nimbu pani made at home with boiled water, or plain warm jeera water, helps with hydration without adding to the nausea. Cold or room-temperature food is sometimes easier to manage if the smell of cooking is triggering symptoms.
Do I need protein supplements or health drinks during treatment?
Whole food sources of protein are the first priority — dal, eggs, paneer, cooked chicken, or fish cover the needs of most people during treatment. Commercial supplements can help if your appetite has dropped severely and you cannot manage adequate food, but they are not automatically necessary for everyone. If you are losing weight or struggling to eat, tell your oncology team rather than self-prescribing. They can refer you to a clinical dietitian if needed.
When can I go back to eating normally?
B cells take several months to recover after rituximab, so food safety precautions apply for longer than the active treatment period alone. The exact timing depends on your blood counts and your individual recovery, not on a fixed calendar. Ask your oncologist at follow-up appointments when it is safe to relax the precautions. Do not stop following them simply because you are feeling well — the changes in immunity are not always noticeable until an infection occurs.