Medical Oncologist
Diet & targeted therapy
Foods to Avoid — on Targeted Therapy
Most foods you eat every day are safe during targeted therapy. But a small number — grapefruit, pomelo, and several common herbal supplements — can change how much of the drug reaches your bloodstream. That is worth knowing before you add anything to your routine.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Grapefruit is the one to know — It and a few related fruits can raise drug levels by blocking a gut enzyme that normally clears the medicine.
- Cooking spices are different from supplements — Turmeric in your daal is fine. A high-dose curcumin capsule is not the same thing at all.
- Herbal preparations carry real risk — Ayurvedic tonics and herbal powders have not been tested alongside most targeted therapies.
- One question protects everything — Tell your oncologist what you are eating and taking before making any change to your routine.
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The main food to avoid on targeted therapy is grapefruit and grapefruit juice. Pomelo (chakotra) has the same effect. Herbal supplements — including high-dose turmeric capsules and Ayurvedic preparations — can interfere with how your body absorbs or clears the drug. Ask your oncologist before adding anything new.
Why do certain foods interfere with targeted therapy drugs?
Targeted therapy drugs are processed in your gut and liver by enzymes that control how much of the drug enters your bloodstream. Certain foods and supplements slow these enzymes down, pushing drug levels higher than intended. Others speed them up, reducing the amount your body actually receives.
Either direction can cause a problem. Too much drug increases side effects. Too little may mean the treatment is not working as well as it should.
This is not a concern with most foods. The list of things that genuinely interfere is short, and ordinary Indian meals — rice, dal, roti, vegetables, fish, chicken — are not on it.
Which foods and supplements should you avoid on targeted therapy?
- Grapefruit and grapefruit juiceBlocks the enzyme that processes many targeted therapy drugs. Even one glass can affect how much drug enters your bloodstream for many hours, so avoiding it entirely is simpler than trying to time it away from your dose.
- Pomelo (chakotra)Contains the same compounds as grapefruit. Avoid it for the same reason.
- Seville oranges and bitter orangeFound in some herbal products and health drinks. Has a similar effect on drug metabolism.
- High-dose curcumin or turmeric capsulesSupplement form is far more concentrated than what you cook with. Ask your team before taking any turmeric supplement, even one marketed as natural.
- Ayurvedic and herbal preparationsChyawanprash, herbal powders, and preparations containing ashwagandha, neem, or similar ingredients have not been tested alongside most targeted therapy drugs. Their effect on drug levels is unknown.
- St. John's WortAn herbal product sometimes taken for mood support, available without prescription. It lowers the blood level of many drugs significantly by speeding up the enzyme that clears them.
- Any capsule, powder, or tonic your oncologist does not know aboutThe safest rule: if it comes in a supplement form and your team has not been told, mention it before you start — or before you continue.
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Does this mean you have to give up traditional Indian cooking?
No. The concern is concentrated supplements, not everyday cooking. Turmeric in your food, fenugreek seeds in your dal, ginger in your chai, coriander, cumin, cardamom — none of these are a problem at the amounts used in normal meals.
What is different is the dose inside a supplement. A curcumin capsule can deliver many times what you would ever get from cooking, and at that concentration it behaves differently in the body.
If a family member is preparing meals and wants to include traditional recipes, those are safe to eat. The question to ask your oncologist is about supplements and tonics taken separately from food — not about what is on your plate.
Did you know?
Grapefruit juice can raise the blood concentration of some targeted therapy drugs well above the intended level — not because it adds to the drug, but because it blocks an enzyme in the gut lining that would normally break the drug down before it enters the bloodstream.
This effect can persist for many hours after a single glass, which is why the recommendation is to avoid it entirely rather than simply timing it away from your dose.
Source: U.S. Food and Drug Administration — Grapefruit Juice and Some Drugs Don't Mix
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Common questions
Frequently asked questions
Can I eat turmeric and haldi while on targeted therapy?
Yes — turmeric used in cooking is safe. The concern is with high-dose curcumin supplements in capsule or powder form, which are far more concentrated than what goes into food. If someone has suggested a turmeric supplement for its anti-inflammatory properties, mention it to your oncologist before you start. Cooking with haldi the way you always have is not something you need to change.
What about green tea — is it safe to drink?
Drinking green tea as a beverage in ordinary amounts is generally fine. Green tea extract in supplement or capsule form is different — it is far more concentrated, and high doses have been flagged in published case reports for effects on the liver. If you enjoy green tea as a drink, you do not need to stop. If you are taking or considering a green tea supplement, tell your oncologist before you start.
Can I take Chyawanprash or other Ayurvedic tonics during treatment?
Check with your oncologist before continuing or starting any of these. Ayurvedic preparations typically contain several herbs together, and most have not been studied alongside targeted therapy drugs. The concern is not that they are harmful by nature, but that their effect on drug levels is genuinely unknown. Tell your treating team exactly what you are taking — including the brand and dose — so they can advise you. This is about protecting the drug from interference, not a judgement about traditional medicine.
Is pomelo the same as grapefruit? Should I really avoid it?
Pomelo is not the same fruit, but it contains similar compounds — furanocoumarins — that affect the same gut enzyme as grapefruit does. Major oncology and regulatory guidance, including from the FDA, lists pomelo alongside grapefruit as a fruit to avoid during treatment with drugs affected by this interaction. If your targeted therapy is one of those drugs, pomelo (chakotra) should be avoided for the same reason as grapefruit.
How do I know whether my specific targeted therapy is affected by these food interactions?
Ask your oncologist or pharmacist directly. Not all targeted therapy drugs are processed by the same enzymes, and the grapefruit interaction applies only to drugs that use a specific metabolic pathway. Your prescribing team will know whether your drug is on that list. If you were not told to avoid grapefruit when your prescription was given, raise it at your next visit — it is a simple and entirely reasonable question to ask.