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Background  We conducted a randomized controlled trial to investigate the effects of consumption of yogurt fermented with  Lactobacillus delbrueckii  ssp.  bulgaricus  OLL1073R-1 in women healthcare workers. In a previous study we used these data to investigate hypothesized preventive effects against flu, however any effects on improving mental quality of life were not analyzed at that time. In the present study, we focus on that aspect.    Methods  The participants (961 women; mainly nurses, aged 20–71 years) were randomly allocated to either the yogurt group (n = 479) or the control group (n = 482). Participants in the yogurt group drank 112 mL of OLL1073R-1 yogurt for 16 weeks, while those in the control group did not consume any yogurt. All participants were prohibited from consuming other yogurt or fermented dairy products during the study period. The participants answered the Pittsburgh Sleep Quality Index (PSQI), Short Form-8 Health Survey (SF-8), and Gastrointestinal Symptom Rating Scale (GSRS) questionnaires at baseline and after 16 weeks.    Results  The PSQI score showed significant improvement after the intake of yogurt ( p  < 0.01). SF-8 results showed significant intervention effects in the General Health and Vitality scores ( p  = 0.02 and  p  = 0.01, respectively). In other subscales of SF-8, we did not observe significant effects of the yogurt. In the GSRS, daily intake of yogurt exerted a preventive effect on constipation ( p  = 0.03).    Conclusions  Consumption of yogurt fermented with  Lactobacillus delbrueckii  ssp.  bulgaricus  OLL1073R-1 enhances subjective psychological quality of life by improving quality of sleep and gastrointestinal condition among women healthcare workers.

bmc gastroenterology

Consumption of OLL1073R-1 yogurt improves psychological quality of life in women healthcare workers: secondary analysis of a randomized controlled trial