The general well-being in work-places is receiving increased attention in Sweden. Not only is the well-being and healthiness important to the individual himself, but also important to fellow co-workers, family members and last but not least to the success of the company. During the last few decades increased focus have been on how to increase well-being by offering company-sponsored health care, memberships in fitness centres and similar programs aiming to prevent and cure disease and to increase physical activity and awareness on health issues.
Comparatively little attention has been on the diet and how a daily healthy diet impacts on general health with the exception of anti-obesity initiatives.
The cost due to short term sick-leave is in Sweden alone estimated to more than 2.2 billion €  and a majority (50–60%) of the episodes are caused by diseases in the respiratory tract (common cold) and gastrointestinal infections .
Of special interest is the well-being among shift-workers as this group is known to be at significantly higher risk to attract short-term illnesses such as the common cold and gastroenteritis .
Probiotics, i.e. naturally occurring bacteria with health benefits are gaining wider acceptance. These bacteria, commonly from the Lactobacillus family have been demonstrated to have numerous potentially important benefits in terms of gut health and immunity , but very few studies address how these effects translate into health benefits in normal populations.
Recently, it was demonstrated in a double blind study  that gastrointestinal illnesses and febrile episodes could be significantly reduced in babies attending day-care centers. This was achieved by adding the probiotic Lactobacillus reuteri to infant formula during a 12 week long study period.
This study aimed to evaluate if similar effects could be achieved in adults and if the addition of the probiotic L. reuteri as a daily dietary supplement can improve work-place healthiness.