Some outlets report that grapefruit may change how long coffee’s “buzz” lasts, but experts emphasize that any effect is uncertain and that grapefruit can create serious drug-interaction risks. The idea is based on the notion that compounds in grapefruit can slow certain metabolic processes, which could potentially alter how quickly the body processes caffeine or related substances. However, at least one chemistry expert quoted in the coverage says there is no guarantee that grapefruit will consistently extend caffeine’s effects.
Both sources highlight the main concern: grapefruit is known to contain chemicals that can interfere with how the liver processes many medications. Doctors and other health professionals typically warn against pairing grapefruit with a range of prescriptions and over-the-counter drugs because the interaction can lead to higher-than-intended drug levels or other adverse effects. The New York Post frames the overall message as weighing a possible (and not clearly proven) benefit against established medication-safety concerns. Overall, coverage suggests that while grapefruit might influence caffeine timing for some people, the medical risks associated with grapefruit-drug interactions are the key factor.
