The tannins from Preisel and blueberries, which belong to the group of phytochemicals, have an inhibiting effect on cystitis caused by E-coli bacteria (Escherichia coli), according to Ines Drewe from the German Institute of Nutritional Medicine and Dietetics (DIET).
With cranberry juice for urinary tract infections
In a Finnish study, 150 women were tested at an average age of 30 who had Escherichia coli-induced urinary tract infection and were not treated with antibiotics. The subjects were divided into three groups for the study. The first group received 50 milliliters of cranberry juice daily over a period of six months. The women in the second group received 100 milliliters of a Lactobacillus GG drink five times a week for five years and the women in the third group received no interventions.
Six months after the start of the study, only 16 percent of the women from the cranberry group had at least relapsed, but 39 percent of the Lactobacillus GG group, and 36 percent of the control group. This shows that cranberry juice significantly minimizes the risk of urinary tract infections. The E-coli bacteria adhere to the urinary epithelia with fine hairs, the fimbriae. Only with this attachment can bacteria cause inflammation.
The tannins of the cranberry juice change the surface structure of the bacteria with the fimbria, so that attachment is no longer possible.
Incidentally, a comparable study was carried out in 1994 with cranberry nectar (cranberry, a berry fruit native to North America). In this placebo-controlled study (Avorn et al.), Older women drank 300 milliliters of cranberry nectar daily for six months. This juice also contains the effective tannins. The study showed that the risk of contracting urinary tract infections was reduced by 58 percent. The DIET experts recommend that women who frequently suffer from urinary tract infections drink a quart of cranberry juice daily.