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H. Pylori, which was vilified in the '90s as the bacteria that causes ulcers, has a positive role: it gives us important feedback on fullness by regulating ghrelin according to this study. Ghrelin is a hormone that stimulates hunger. One side effect of ulcer treatment was that the ulcer patients became obese after eradicating H. Pylori. Ghrelin is produced in the stomach and acts as a neurotransmitter. If ghrelin levels are unregulated, you never feel full. Because of antibiotic use over generations, increasing numbers of children today have no H. Pylori, which may be contributing to the rise of childhood obesity. Additionally, people with H. Pylori have been shown to be at reduced risk for celiac disease, irritable bowel syndrome (IBS), gastro-esophageal reflux disease (GERD), and esophageal adenocarcinoma.
The NCBI, which is part of the National Institute of Health, talks about management of H. Pylori levels by use of diet if gastric ulcers are detected. Things like drinking sauerkraut juice and eating other Brassica vegetables like cauliflower or broccoli sprouts can help. Adding manuka or oak honey, or high bush blueberry juice have all shown benefits. As always, follow the advice of your doctor. Given the downside of H. Pylori eradication, a peaceful coexistence seems to be the best bet.