> <i>Grapefruit is known to interact with certain medications —sometimes adversely — so the researchers caution people on prescription medication to consult with their doctor or pharmacist to determine whether their medicine will interact before consuming grapefruit products. Appropriate exercise, well-balanced nutrition and avoidance of tobacco also are important factors in reducing the risk of heart disease, health experts say.</i><p>This. (From the article) if you are on almost any kind of meds, talk to your doctor before eating grapefruit if they are not already aware of this component of your diet.<p>I still get asked about it, and garlic quite a lot. Which is reassuring.<p>it can (I believe) interact with a huge number of treatments.