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A “nutritionist” isn’t an actual title - anyone can call themselves this. I don’t know if this person you are talking to is an actual “Registered Dietician” but I highly doubt it based on the advice you have received. H Pylori causes ulcers which can actually be life threatening - and though I am a fan of many alternative medical methodologies I would be very suspect of someone that suggest you take an unproven treatment for a disease that can literally kill you. The advice is probably from an untrained healer at best - and possibly a deeply unethical person. Take some antibiotics if you actually have an H Pylori infection.