Systematic review: are probiotics useful in controlling gastric colonization by <i>Helicobacter pylori?</i>

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<jats:title>Summary</jats:title><jats:p> <jats:italic>Helicobacter pylori</jats:italic> is a highly prevalent pathogen considered as an aetiological factor for gastroduodenal ulcers, and a risk factor for gastric adenocarcinoma and lymphoma in humans. Most subjects colonized by this micro‐organism are asymptomatic and remain untreated. In symptomatic patients, the antibiotic treatment has a high cost and is not 100% effective because of resistance to antibiotics and to moderate patient compliance. This review discusses the role of probiotics as alternative solutions to assist in the control of <jats:italic>H. pylori</jats:italic> colonization in at‐risk populations.</jats:p><jats:p>The evidence that some strains of <jats:italic>Lactobacillus</jats:italic> and <jats:italic>Bifidobacterium</jats:italic> are able to inhibit <jats:italic>H. pylori</jats:italic> growth through the release of bacteriocins or organic acids, and may also decrease its adhesion to epithelial cells, is reviewed. In addition, probiotics have a possible role in the stabilization of the gastric barrier function and the decrease of mucosal inflammation. Other aspects that are considered are the contribution of probiotics to the healing of the gastric mucosa linked to their antioxidant and anti‐inflammatory properties.</jats:p><jats:p>Clinical trials in colonized adults and children are reviewed, and suggest that probiotics do not eradicate <jats:italic>H. pylori</jats:italic> but maintain lower levels of this pathogen in the stomach; in combination with antibiotics, probiotics may increase eradication rate and/or decrease adverse effects. Papers suggesting similar effects on <jats:italic>H. pylori</jats:italic> by foodstuffs such as berry juice and some milk proteins are quoted. Regular intake of these and other dietary products might constitute a low‐cost, large‐scale alternative solution applicable for populations at‐risk for <jats:italic>H. pylori</jats:italic> colonization.</jats:p>

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