GrapefruitA recent study focused on benefits of eating grapefruit:

Two grapefruits a day can reduce gum bleeding for those who suffer from gum disease.  A two week study found that eating two grapefruits a day raised Vitamin C levels which promotes healing and aids in the repair of gums.  The vitamin C level of smokers in the study almost doubled. 

Health E Guide Comment: Some people cannot tolerate grapefruit or are taking medications that should not be combined with grapefruit.  Consultation with a health practitioner is advised.