A case-control study of association of Helicobacter pylori infection with morbid obesity in Taiwan

Arch Intern Med. 2005 Jul 11;165(13):1552-5. doi: 10.1001/archinte.165.13.1552.


Background: Obesity is an increasing health problem in developed countries, where the prevalence of Helicobacter pylori infection is decreasing. Recent studies suggested colonization of the stomach by H pylori might affect gastric expression of appetite- and satiety-related hormone and patients cured of H pylori infection gained weight. It was hypothesized that H pylori could be a contributing pathogenic factor in childhood and adult obesity.

Methods: To determine whether H pylori infection is linked to obesity, a case-control study composed of 414 patients with morbid obesity (a body mass index [calculated as weight in kilograms divided by the square of height in meters] of > or = 35 with serious comorbidity or a body mass index of > or = 40) and 683 control subjects (a body mass index of <25) with a comparable socioeconomic status was conducted. Immunoglobulin G antibodies against H pylori were measured from frozen serum samples by an enzyme-linked immunosorbent assay. Logistic regression was used to calculate the odds ratio (OR) and 95% confidence interval (CI).

Results: The overall seropositivity was significantly lower in obese patients (181 [43.7%] of 414) than controls (410 [60.0%] of 683) (OR, 0.50; 95% CI, 0.39-0.65; P<.001). Differences in the estimated risk of the presence of H pylori were more pronounced in younger age groups, with ORs of 0.32 (95% CI, 0.10-1.00; P = .05) in those aged 10 to 19 years, 0.55 (95% CI, 0.34-0.89; P = .01) in those aged 20 to 29 years, 0.49 (95% CI, 0.30-0.80; P = .007) in those aged 30 to 39 years, and 0.58 (95% CI, 0.33-1.00; P = .05) in those aged 40 years or older.

Conclusions: Our data indicated an inverse relationship between morbid obesity and H pylori seropositivity. These findings raise the hypothesis that a lack of H pylori infection, especially during childhood, might enhance the risk of the development of morbid obesity.

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Antibodies, Bacterial / analysis
  • Body Mass Index
  • Female
  • Follow-Up Studies
  • Helicobacter Infections / epidemiology
  • Helicobacter Infections / etiology*
  • Helicobacter Infections / microbiology
  • Helicobacter pylori / immunology
  • Helicobacter pylori / isolation & purification
  • Humans
  • Incidence
  • Male
  • Nephelometry and Turbidimetry
  • Obesity, Morbid / complications*
  • Obesity, Morbid / epidemiology
  • Observer Variation
  • Retrospective Studies
  • Risk Factors
  • Seroepidemiologic Studies
  • Stomach / microbiology
  • Taiwan / epidemiology


  • Antibodies, Bacterial