Why Can Grapefruit Interfere With Some Medications?

Because it can. So is grapefruit healthy or unhealthy?

"Certain foods and drinks don't mix well with certain medications. For example, grapefruits or grapefruit juice may interact badly with a number of medications, because natural grapefruit contains a substance that affects the activity of an enzyme in the intestines and liver that processes these medications. This could result in a dangerous increase in the level of the drug in your blood.

So are multivitamins and supplements healthy or unhealthy?

"Another potentially dangerous interaction is between the blood thinner warfarin (Coumadin and generic brands) and vitamin K. The vitamin, present in many multivitamins and supplements, neutralizes or reduces the effect of the medication warfarin. This raises the risk of a blood clot, which the warfarin is intended to prevent."

What about oranges?

"One further note: In reference to the control group in the study, regular orange juice was found to be safe to drink with Plendil. However, you may want to avoid Seville oranges in juice or marmalade, as they are the only type of oranges to contain furanocoumarins."

Good luck sorting this stuff out.

Or just acknowledge the fact that there are no "healthy" foods of which we know, only eating healthily.