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Gut BODY HANDBOOK
Gut ยท ยง54
Bloating
Bloating hits about one in five adults, twice as often in women Sandler et al. 2000, and most people reach for anti-gas drops and charcoal. Here's what you didn't know you didn't know: the belly that pushes out usually holds no more gas than a calm one Accarino et al. 2009. It swells because the diaphragm drops and the wall gives, and the nerves read normal pressure as pain. Aim at the diet and the gut-brain wiring, and it settles in weeks.
Condition Evidence Moderate Chapter Gut

Two different things get lumped together. Bloating is the feeling of pressure; distension is the waistband actually tightening. When the belly pushes out, more gas didn't arrive โ€” the diaphragm drops and the front wall relaxes, so the same contents redistribute outward 1. And the gut's normal signals come through too loud, so ordinary volumes feel like a tight band 2.

When there is real gas, it's usually FODMAPs: short-chain carbs like lactose, fructose, the fructans in wheat and onion, and the polyols in sugar-free gum. They reach the colon undigested and ferment, pulling in water and making gas 3.

For ordinary functional bloating, four things have real backing. A low-FODMAP diet cuts symptoms by roughly half, with 50โ€“80% of people responding 4. Enteric-coated peppermint oil more than doubles the odds of improvement 5. A two-week course of rifaximin, a gut-selective antibiotic, helps when bloating is the main complaint 6. And the one people don't expect: gut-directed hypnotherapy, one of the biggest effect sizes in gut medicine 7. The 2021 guideline backs the first three and advises against probiotics as a class 8.

Clear the red-flag list first, then work the rungs in order. Most people never get past the second.

The first sign is the afternoon you get back: lunch goes in and an hour later you're working, not waiting. Within 2โ€“4 weeks of a proper low-FODMAP trial, half to four-fifths of responders see a real drop 4. By month two or three the morning waistband stops being a decision. By a year, food is normal again: you know your triggers and can have onion at dinner. It can recur under stress or antibiotics, so the protocol becomes something you run when you need it.

The fine print โ€” when to skip it, and what people get wrong

"It's trapped gas." A bloated gut holds about the same gas as a calm one, so simethicone and charcoal miss 1. "A probiotic fixes it." The drugstore bottle rarely holds the studied strains; the guideline advises against them as a class 8.

Staying on strict low-FODMAP for months is the top failure; reintroduction only gets harder 3. Treating it as purely physical is the other: quieting the nerves changes the symptom even when gas and diet haven't budged 7.

References
  1. 1Accarino A, Perez F, Azpiroz F, Quiroga S, Malagelada JR (2009). Abdominal distention results from caudo-ventral redistribution of contents. Gastroenterology. link
  2. 2Houghton LA, Lea R, Agrawal A, Reilly B, Whorwell PJ (2006). Relationship of abdominal bloating to distention in irritable bowel syndrome and effect of bowel habit. Gastroenterology. link
  3. 3Staudacher HM, Whelan K (2017). The low FODMAP diet: recent advances in understanding its mechanisms and efficacy in IBS. Gut. link
  4. 4Halmos EP, Power VA, Shepherd SJ, Gibson PR, Muir JG (2014). A diet low in FODMAPs reduces symptoms of irritable bowel syndrome. Gastroenterology. link
  5. 5Khanna R, MacDonald JK, Levesque BG (2014). Peppermint oil for the treatment of irritable bowel syndrome: a systematic review and meta-analysis. Journal of Clinical Gastroenterology. link
  6. 6Pimentel M, Lembo A, Chey WD, et al. (2011). Rifaximin therapy for patients with irritable bowel syndrome without constipation. New England Journal of Medicine. link
  7. 7Ford AC, Quigley EM, Lacy BE, et al. (2014). Effect of antidepressants and psychological therapies, including hypnotherapy, in irritable bowel syndrome: systematic review and meta-analysis. American Journal of Gastroenterology. link
  8. 8Lacy BE, Pimentel M, Brenner DM, et al. (2021). ACG Clinical Guideline: Management of Irritable Bowel Syndrome. American Journal of Gastroenterology. link
  9. 9Lacy BE, Mearin F, Chang L, et al. (2016). Bowel Disorders. Gastroenterology. link
  10. 10Goff BA, Mandel LS, Drescher CW, et al. (2007). Development of an ovarian cancer symptom index: possibilities for earlier detection. Cancer. link
Related in the handbook (11)
Helped by
  • โ€” Wolfing food half-chewed is a common, fixable contributor to bloating.
  • โ€” Before blaming a food for bloating, check how you're sitting and how fast you're eating.
  • โ€” When bloating tracks with IBS, a proper low-FODMAP run is the most reliable dietary fix.
  • โ€” Constant snacking blocks the gut's cleanup cycle โ€” spacing meals out is a free fix for some bloating.
Related
  • โ€” Backed-up stool is a common driver of bloating โ€” clearing constipation often deflates it.
  • โ€” Colonics are sold for bloating, but they don't fix the cause โ€” and bloating is usually treatable other ways.
  • โ€” Getting the fibre type wrong is a common, fixable bloating trigger: too much of the gassy kind backfires. Match the fibre to the symptom.
  • โ€” Much of bloating is the brain misreading normal gut volume as painful pressure โ€” a gut-brain loop.
  • โ€” Bloated afternoons are a classic part of the histamine-intolerance cluster.
  • โ€” Bloating is one of the core IBS symptoms โ€” and one of the first to ease on treatment.
  • โ€” SIBO is one real cause of stubborn bloating โ€” but only a minority of bloaters actually have it.
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