Myths vs facts: Helicobacter and allergy

The relationship between Helicobacter pylori infection and allergies is a topic of ongoing debate. The hygiene hypothesis suggests that early-life exposure to H. pylori may protect against allergic diseases by promoting regulatory immune responses. Some observational studies report lower H. pylori seroprevalence in individuals with asthma, hay fever, or atopic dermatitis, supporting a protective role. However, other studies find no association or even a positive link, particularly with certain H. pylori strains or in specific populations. The evidence is mixed and largely derived from cross-sectional and cohort studies; no randomized controlled trials have tested causality. Furthermore, H. pylori infection is not directly detectable by consumer DNA tests like MyBody-X; clinical diagnosis requires stool antigen tests or urea breath tests. Genetic susceptibility to H. pylori infection is not well-established. In summary, current evidence does not support using H. pylori status to predict, prevent, or manage allergies. The hygiene hypothesis remains plausible but unproven, and more rigorous research is needed.