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A group known as the Environmental Working Group (EWG) produces a list each year of fruits and vegetables with the highest levels of pesticide residue, known as the Dirty Dozen. Grapes are currently number 8 on this list. Buying organic grapes can reduce the risk of pesticide exposure.
Beta-blockers are commonly prescribed for heart disease. They can cause potassium levels to increase in the blood. People who use beta blockers should consume foods that are high in potassium in moderation.
People who use blood-thinning drugs should speak to their doctor before consuming large quantities of grapes, as resveratrol may increase the anticoagulant action of these drugs, in a similar way to Vitamin K. Warfarin, or Coumadin, is a popular blood thinner.
Consuming too much potassium can be harmful to those whose kidneys are not fully functional. If the kidneys cannot remove excess potassium from the blood, this can be fatal.
When drinking wine, women are advised to drink no more than one drink a day, and men no more than two. *
