It has long been known that drinking cranberry juice can help to clear up urinary infections. Yesterday however, scientists from Oulu University , in Finland, officially proved the beneficial effects of cranberry, revealing the conclusions of a yearlong study on the topic. Bacteria cause urinary infections in up to 60% of women at some point in their lives, and researchers in the paediatric department of the university have shown that the medicinal role of cranberry in clearing up the infection is down to the tannins in the juice.