Medical Oncologist
Eating well on Enhertu
Diet and Nutrition — While on Trastuzumab Deruxtecan
Nausea and a reduced appetite are among the most common effects of trastuzumab deruxtecan. The goal is not a perfect diet. It is eating enough, often enough, to keep your strength and let the treatment do its work.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Small and often beats large and rarely — Five or six small meals are easier to manage than two or three full plates on difficult days.
- Cold food causes less nausea than hot — Room-temperature or cold curd rice, idli or fruit tends to be better tolerated than steaming dishes.
- Your usual food is usually fine — You do not need a special diet. The adjustment is in portion size, temperature and timing, not the food itself.
- Tell your team what you are taking — Home remedies, supplements and herbal teas can interact with treatment — your oncologist needs to know about them.
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Trastuzumab deruxtecan commonly causes nausea and reduced appetite. Eating small amounts frequently — khichdi, plain dal rice, idli, curd — works better than three full meals. Cold or room-temperature food is easier to tolerate than hot dishes in the days after infusion. Your team will prescribe anti-nausea medicine; eating strategy works alongside that.
Which Indian foods are easiest to eat when nausea is bad?
Khichdi — moong dal and rice cooked soft — is the most reliable food on difficult days. It is easy to digest, gives you some protein and carbohydrate, and can be eaten in small amounts at a time.
Plain curd rice, idli without heavy chutney, banana, and plain poha with minimal oil are other foods most people find manageable. These are starting points on the days when eating anything at all is an effort, not substitutes for a full diet.
Strongly spiced gravies, deep-fried snacks, very oily dishes, and anything with a pungent smell tend to make nausea worse. This is not a permanent restriction — most people can return to their usual food between cycles as their appetite settles.
If you are from Andhra or Telangana, you may find milder versions of your usual dishes easier to manage: pesarattu with less oil, mild rasam over tamarind-heavy curries, or plain rice with a thin dal rather than a spiced fry.
How to eat around your infusion day
Morning of infusion
Eat a light meal about two hours before you leave home. Idli, plain toast, or a small bowl of upma works well. Do not go in on an empty stomach, but avoid a heavy or oily meal.
Evening after infusion
Your anti-nausea medicine is working now, but nausea can still come. Eat something small even if you do not feel hungry — curd rice, a banana, or a plain roti with dal. Do not force a full plate.
Days 1 to 5 after infusion
Nausea is typically most noticeable during this window. Switch to cold or room-temperature food. Plain poha, curd, fruit, and nimbu pani with a pinch of salt are more manageable than hot cooked meals.
When appetite starts to return
Reintroduce your usual foods slowly. Start with whatever appeals to you, keep portions small, and add protein — eggs, dal, curd, paneer — before returning to heavy or spiced dishes.
Between cycles
This is the time to rebuild. Eat as varied a diet as you can manage. You do not need to make up for lost intake in one go — consistency over the week matters more than one large meal.
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How do you keep your protein and fluid intake up?
Protein supports your body's recovery between cycles. Dal, eggs, curd, paneer, and sprouts are practical sources that can be eaten in the small portions that treatment days allow.
Staying hydrated matters as much as food. Sip fluids through the day rather than drinking a large amount at once — coconut water, plain water, nimbu pani with a pinch of salt, or thin buttermilk are all good choices. Avoid alcohol throughout your treatment.
If your blood counts are low, your oncologist may advise against raw or unwashed produce and unpasteurized dairy for a defined period. Ask specifically about this at your next appointment rather than assuming it applies throughout.
You do not need expensive protein shakes or supplements unless your team recommends them. The foods you already know are enough if you can eat them in adequate amounts.
Questions families ask about food on this treatment
Can I eat spicy food?
Spicy food is not dangerous on trastuzumab deruxtecan, but it can make nausea and any mouth soreness worse, especially in the first few days after infusion. Most people find it easier to eat milder food during that window and return to their usual spice level as the week progresses. There is no need to permanently give up spice — adjust it around how you feel rather than following a fixed rule for the whole treatment period.
Is street food or restaurant food safe?
If your blood counts are within a safe range, your oncologist is unlikely to ban restaurant food entirely. The practical concern is food hygiene during periods when your immunity is lower — raw chutneys, cut fruit from stalls, and food kept at room temperature for long periods carry a higher risk of infection. Home-cooked food, freshly prepared and fully cooked, is the lower-risk option during treatment. Ask your oncologist what restrictions apply to your situation and your current blood count specifically.
Can I drink herbal teas, kadha, or ginger water?
Plain ginger tea or ginger water is commonly used for nausea and is generally considered low-risk, though tell your oncologist you are taking it. Kadha recipes vary widely — some contain ingredients that can affect how drugs are processed by the liver. Tulsi, ashwagandha, and certain other herbs in concentrated form are not automatically safe alongside a cytotoxic treatment. The safest approach is to share the exact ingredients with your oncology team before continuing. 'Herbal' does not mean harmless in this context.
My family wants me to take turmeric, ashwagandha or other supplements — is that safe?
This is one of the most important questions to raise with your oncologist. Some supplements can affect how trastuzumab deruxtecan is absorbed or broken down. Turmeric in cooking amounts is not the same as high-dose curcumin capsules — concentrated supplements behave differently. Ashwagandha affects the immune system in ways that may interact with treatment. Your oncologist is not dismissing your family's care by asking you to pause these — they are protecting the treatment's effectiveness. Bring a list of everything you are taking, including brand names and doses.
Should I follow a special anti-cancer diet?
There is no diet that has been shown to make trastuzumab deruxtecan work better or to treat cancer directly. What nutrition guidance from bodies such as ESMO and ASCO supports during treatment is maintaining adequate calorie and protein intake, staying hydrated, and avoiding foods that pose an infection risk when immunity is low. Extreme approaches — very low calorie, ketogenic, or juice-only — risk malnutrition during treatment, which makes side effects harder to manage and recovery slower. Eat well and eat enough; that is the goal.
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Common questions
Frequently asked questions
Can I eat curd and dairy products during this treatment?
Yes, curd, paneer, and dairy are generally fine on trastuzumab deruxtecan, and curd in particular is one of the easier foods to eat on nausea days. The one exception is unpasteurized dairy — including some home-made paneer from raw milk — which carries a higher infection risk during periods when your blood counts are low. Ask your oncologist whether your current counts warrant any restriction. Commercially packaged, pasteurized dairy products are safe for most people in treatment.
I have completely lost my appetite. What should I do?
Tell your oncologist or the nursing team at your next visit — or sooner if it is severe. Appetite loss that stops you eating for more than a day or two is a clinical concern, not just a discomfort. Your team can assess whether anti-nausea medication needs to be adjusted or whether nutritional support is needed. In the meantime, prioritise calorie-dense small foods — a small bowl of curd with banana, a glass of full-fat buttermilk, or a spoon of nut butter — over large low-calorie meals.
Is it safe to fast for religious or cultural reasons during treatment?
Tell your oncologist before a planned fast. A short fast on a day when you are feeling well and your counts are stable may be manageable, but fasting immediately after an infusion — when nausea is at its peak and your body needs fuel for recovery — adds an additional burden. Your oncologist can tell you which days in your cycle are higher risk and help you plan around them. Most oncologists will not say fasting is categorically forbidden; they will help you do it as safely as possible.
Can I eat eggs and non-vegetarian food?
Yes. Well-cooked eggs, chicken, and fish are good protein sources during treatment. The practical rule is that all meat and eggs should be fully cooked — avoid raw eggs, undercooked chicken, and raw fish or shellfish, because the infection risk is higher when immunity is lower. Grilled or boiled preparation is easier to eat than heavily fried or spiced dishes on nausea days. If you are vegetarian, dal, curd, and paneer give you the same protein benefit.
My weight is dropping. Does that affect the treatment?
Significant weight loss during treatment is worth reporting to your oncologist rather than waiting for your next scheduled appointment. Weight is monitored as part of your treatment assessment, and losing weight rapidly can affect how well you tolerate treatment and how quickly you recover between cycles. Your oncologist may refer you to a dietitian or recommend nutritional support. The earlier the team knows, the more options are available to address it.