Grapefruit is known for helping to prevent certain types of cancers. The one thing you have to be careful with is that it is strongly acidic and can affect the way your stomach breaks down anything from food to medications. Drinking the juice is fine as long as you drink it in moderation. My father gets heartburn and he is advised to stay away from things like grapefruit, orange juice and some tropical fruits because of the enzymes they have. Hope that helps some what!Response postedNov 16 2008 Currently Rated1