Chapters
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Opportunistic pathogens
Germs that only become a problem when the balance is off. 2 chapters – expand
- Level:Intermediate After antibiotics: C. difficile and faecal transplants A germ that can take over after antibiotics, and a treatment that works better than any drug. AntibioticsFaecal transplantProbioticsDiarrhoeaGut infectionsBile acidsToxins and mould Established How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open.
- Level:Intermediate Gut and cancer: what the gut microbiota protects against, what harms, and why it matters in cancer treatment Fibre and its bacteria protect against colorectal cancer, while some bacteria damage the genome. Why colorectal cancer is rising in people under 50, which germs travel along in tumours, what Helicobacter has to do with stomach cancer, and why the gut microbiota helps decide whether immunotherapy works. FibreInflammationAntibioticsProbioticsTests and diagnosticsMouth and teethFaecal transplantBile acids Promising How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open.
Immune system and inflammation
The gut as the body's largest immune organ. 1 chapter – expand
- Level:Intermediate Crohn’s disease and ulcerative colitis: understanding inflammatory bowel disease In Crohn’s disease and ulcerative colitis, the immune system permanently attacks the gut wall. What distinguishes the two, what role genes, smoking, antibiotics and gut microbiota play, why early treatment matters, and what diet, probiotics and faecal transplants really achieve. InflammationDiarrhoeaTests and diagnosticsMedicationAntibioticsNutrientsProbioticsFaecal transplantMediterranean diet Established How we rate the evidence Established Recommended in medical guidelines or supported by several consistent meta-analyses of randomised human studies. Well supported Several randomised studies in humans with largely consistent results. Promising Single randomised or controlled studies in humans, not yet independently confirmed — or many consistent observational studies. Plausible Two cases: first observational or pilot studies with small samples — or a settled basis that is not in dispute, such as movement, sleep or meal pauses. But not tested in humans for symptoms. Experimental Barely studied in humans. Mainly lab and animal studies or theoretical reasoning; whether it helps is open.