Grapefruit
Grapefruit is a large citrus fruit rich in vitamin C, fiber, and plant compounds called flavonoids. It is notable for its interaction with metabolic enzymes, which affects how the body processes certain medications.
Also known as: Citrus x paradisi, Grapefruit juice, Pink grapefruit, Red grapefruit, White grapefruit
Scientific & Editorial Standard: This information is synthesized from peer-reviewed databases (such as PubMed, NIH, NHS, and Mayo Clinic) and validated using multi-model cross-referencing by the Plateify Editorial Team. It is intended for educational purposes and is not medical advice. If you suspect food sensitivities, consult a healthcare provider.
Grapefruit (Citrus x paradisi) is a hybrid citrus fruit that originated in Barbados in the 18th century. It is now widely cultivated in subtropical and tropical regions, particularly in Florida, Texas, and California in the United States, as well as in Brazil, China, and the Mediterranean. Fresh grapefruit is commonly consumed as juice, eaten as a half fruit with a spoon, or used in beverages and salads. Pink and red varieties, which contain lycopene, are more common in retail markets than white varieties.
A medium grapefruit provides a moderate amount of calories, protein, carbohydrates, dietary fiber, and natural sugars. It is an excellent source of vitamin C and also contains potassium, folate, and flavonoids such as naringin and quercetin. The fiber in grapefruit is distributed between soluble and insoluble forms, supporting normal digestion.
Medication Interactions
Grapefruit contains furanocoumarins—plant compounds that irreversibly inhibit CYP3A4, a major metabolic enzyme in the small intestine and liver. This inhibition can significantly elevate blood levels of certain medications, including some statins (atorvastatin, simvastatin), blood pressure drugs (felodipine, verapamil), and immunosuppressants. The effect begins with a single glass of juice and can persist for 24 to 72 hours after consumption. Note that some drugs (such as fexofenadine) show reduced absorption with grapefruit rather than increased levels, so effects vary by medication. Individuals taking prescribed medications should consult their healthcare provider or pharmacist before consuming grapefruit or grapefruit juice to assess individual risk.
Tolerance and Consumption
Grapefruit is well tolerated by most people at typical consumption levels. It is not a common allergen and contains no gluten. Because of its acidity and citric acid content, individuals with gastroesophageal reflux or tooth sensitivity may experience discomfort with frequent consumption or fresh juice. Those with chronic kidney disease or taking potassium-sparing medications should monitor intake due to moderate potassium content. Standard portion guidance is one-half to one whole fruit or 240 mL of juice per serving; no specific upper limit exists for the general population.
Frequently Asked Questions
Does grapefruit interact with all medications?
No. Grapefruit specifically interacts with medications metabolized by CYP3A4, including certain statins, blood pressure medications, and immunosuppressants. Some medications may have reduced absorption rather than elevated levels. Other medications are unaffected. Check with your pharmacist or doctor about your specific medications.
Does cooking or processing grapefruit remove the compounds that interact with medications?
Furanocoumarins, the compounds responsible for drug interactions, are relatively heat-stable and are present throughout grapefruit tissues. Significant interaction potential is retained after pasteurization and standard processing. Fresh juice, commercially pasteurized juice, and whole segments all carry interaction risk and should be treated with the same caution.
Is grapefruit a good source of fiber?
Grapefruit provides a modest amount of dietary fiber in both soluble and insoluble forms. Eating the whole fruit rather than drinking juice preserves more of the fiber content.
Sources
- Grapefruit Juice and Some Drugs Don't Mix — FDA
- Grapefruit and Drug Interactions — Mayo Clinic
- The Nutrition Source: Citrus — Harvard T.H. Chan School of Public Health
- FoodData Central: Grapefruit, raw, pink and red, all areas — USDA
Educational content: This page is for general informational purposes only. Individual responses to foods vary widely. If you suspect a food allergy or sensitivity, consult a licensed dietitian, allergist, or physician before making dietary changes. Full disclaimer
Some content on this site is AI-assisted. While we strive for accuracy, information may not reflect the latest research. Always verify health information with a professional.
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