A new warning for anyone who enjoys a glass of grapefruit juice.
Mixing it with certain medication can be dangerous.
There are now more than 85 oral prescriptions that should not be taken with grapefruit.
Half of them can have serious adverse effects, such as kidney damage, blood clots, and even death.
Many of those drugs are for treating common conditions like Lipitor for lower cholesterol or Prozac for depression.
Grapefruit interferes with the body's ability to break down the drug, increasing its potency.
The study says people over 45 are most vulnerable and should check with their doctor about the potential for problems.