Yes. Fruit juice can be drunk as part of a healthy, balanced diet. It is a good source of vitamin C, potassium and folates, amongst other nutrients. Vitamin C is essential for a healthy immune system, potassium and folates help with cell and muscle tissue repair. This is why a 150ml glass of fruit juice counts as one of your five-a-day.
Dietary evidence has shown that individuals who consume fruit juice regularly, in the recommended portion size, have a greater intake of fruit and vegetables than individuals who do not (National Diet and Nutrition Survey, May 2014, (please see: www.gov.uk/government/statistics/national-diet-and-nutrition-survey-results-from-years-1-to-4-combined-of-the-rolling-programme-for-2008-and-2009-to-2011-and-2012).
Because of its vitamin C content, consuming fruit juice as part of a meal can help to increase the absoprtion of iron-rich foods like (some) fortified cereals, beans, pulses, spinach and kale.