Bottled cranberry juice is typically a blend of cranberry juice mixed with sweet fruit juices like grape, apple, or pear to balance out the tartness of pure, unsweetened cranberries. The cranberries in the juice provide antioxidants that may help prevent cataracts and macular degeneration, as well as urinary tract infections. If you have type 2 diabetes it is best to avoid cranberry juice and other fruit juices because of the high sugar concentration. IBS sufferers take note: Some people with IBS are sensitive to sources of concentrated sugar like fruit juice and experience discomfort after consuming them.