Name: Diverticular Disease: The Nuts-and-Seeds Rule Was Wrong, and Not Every Flare Needs Antibiotics
Creator: Realised
Published: 2026-06-01

Summary

Two pieces of long-standing diverticular advice have quietly reversed: the decades-old ban on nuts, seeds and popcorn was never evidenced and a large prospective cohort found no harm (if anything a protective trend), and antibiotics are no longer mandatory for CT-confirmed acute UNCOMPLICATED diverticulitis (two randomised trials show observation is non-inferior, and the guidelines now say use them selectively, not automatically) — but neither reversal touches the two hard rules underneath: complicated diverticulitis (abscess, perforation, obstruction) still needs antibiotics and urgent assess

Why Moderate

Moderate overall because the entry's claims sit at genuinely mixed evidence grades and carry live clinical judgement rather than a single settled axiom. The antibiotic-omission strand is randomised-grade (two multicentre RCTs plus an IPD meta-analysis), which is strong for that specific claim; the nuts/seeds reversal and the colonoscopy cancer-yield are large observational and meta-analytic; and the fibre-for-established-disease strand is deliberately very low quality. Averaging across those, and given the load-bearing safety guardrails that depend on guideline consensus rather than trials, Moderate is the honest headline.

NOT Strong because the diet strands (fibre, and even the strong nuts/seeds cohort) are observational, the fibre-for-symptoms evidence is very low quality, and the safety net (colonoscopy, complicated-disease management) rests on guideline consensus and prevalence data rather than randomised outcome trials.

NOT Foundational or Experimental — the reversals are real and evidenced enough to act on (not experimental), but they carry a live both-ways tension and clinical caveats (not a single undisputed axiom).

The per-strand split (read this, not just the headline):
• Antibiotics not mandatory for uncomplicated diverticulitis: Strong for the claim (AVOD + DIABOLO + IPD meta-analysis).
• Nuts/seeds/popcorn not harmful: Moderate (large prospective cohort against a zero-evidence prior).
• Follow-up colonoscopy / cancer yield: Moderate (meta-analytic prevalence + guideline consensus) — the load-bearing safety claim.
• Fibre for PREVENTION of incident disease: Moderate (guideline-endorsed, conditional).
• Fibre for established symptomatic disease: very low certainty — the entry marks it as over-promised, not a treatment.

Practical takeaway

The framing to hold: two old rules have relaxed (eat the nuts and seeds; not every uncomplicated flare needs antibiotics), but the safety net has not — complicated disease needs treatment, and a first episode needs a scope.

Drop the nuts-and-seeds restriction.
• Nuts, seeds, corn and popcorn are NOT associated with diverticular flares or bleeding; the prospective data show a protective trend. If you have diverticulosis, you do not need to avoid them, and cutting them needlessly removes healthy fibre-rich foods.

Use fibre for prevention, framed honestly.
• A fibre-rich diet is a reasonable lever to reduce the risk of incident diverticulitis and is what the guideline suggests for people with a history of episodes. Treat it as prevention and support, not as a cure for a currently symptomatic segment. (The mechanics and dosing of fibre are owned by dietary_fiber_diversity_and_microbiome_health; managing the constipation fibre also targets is owned by constipation_evidence_and_management.)
• Do NOT over-promise fibre for already-established symptomatic disease — the evidence there is very low quality.

Understand the antibiotic shift — and its limits.
• For a CT-confirmed acute UNCOMPLICATED diverticulitis episode in a stable, immunocompetent patient, antibiotics are not automatic; guidelines now support selective use, and observation is a validated option under clinical supervision. This is a conversation to have with the treating clinician, not a reason to self-manage.
• This applies ONLY to uncomplicated, imaged, stable disease. It does not apply to complicated presentations, sepsis, immunosuppression, or situations where imaging is unavailable.

Do not skip the follow-up colonoscopy.
• After a first diverticulitis episode, a follow-up colonoscopy (typically around 6–8 weeks after resolution, if you have not recently had a high-quality exam) is recommended to exclude an underlying colorectal cancer. The yield is real, and higher after complicated disease. No dietary change substitutes for it.

Know when it is not self-management.
• High fever, severe or worsening pain, inability to keep fluids down, rectal bleeding, a rigid/tender abdomen, or being immunocompromised are reasons to seek medical assessment promptly, not to ride it out.

Evidence detail

Why This Entry Exists

Diverticular disease is a place where the folk model and the outdated clinical model both need correcting, and the corrections cut in opposite directions. On the reassuring side, two pieces of received wisdom were simply wrong: that people with diverticulosis must avoid nuts, seeds, corn and popcorn for fear a fragment lodges in a pouch and triggers a flare, and that every bout of acute diverticulitis needs a course of antibiotics. The nuts-and-seeds rule had no controlled evidence behind it and a large prospective cohort has now overturned it; the reflexive-antibiotics rule has been undercut by two randomised trials and revised in the guidelines. Getting a patient to stop needlessly restricting healthy fibre-rich foods, and helping a clinician avoid an unnecessary antibiotic course for mild uncomplicated disease, are both real wins.

But the opposite errors are common and one of them is dangerous. Fibre gets over-promised: it is a reasonable lever for PREVENTING incident diverticulitis, but the evidence that it relieves ALREADY-established symptomatic disease or prevents recurrence is very low quality, and selling it as a cure for a symptomatic patient over-reaches the data. And the genuinely harmful failure mode is letting "not every flare needs antibiotics" bleed into complicated presentations — an abscess, a perforation, an obstruction, or a septic or immunosuppressed patient — where withholding antibiotics and imaging is exactly the wrong move. The second dangerous omission is skipping the follow-up colonoscopy after a first episode, because a meaningful minority of what looks like diverticulitis, especially complicated diverticulitis, is masking a colorectal cancer.

So this entry holds the reassurance and the guardrails at once. Drop the nuts-and-seeds fear; treat fibre as a modest prevention lever, not a treatment for established symptoms; support antibiotic de-escalation ONLY for uncomplicated CT-confirmed disease in stable patients; and never let de-escalation blur the red flags — complicated diverticulitis needs antibiotics and surgical/imaging assessment, and a first episode needs a colonoscopy to exclude cancer.

What bad advice this protects against, in all directions:
• "If you have diverticulosis, avoid nuts, seeds, corn and popcorn" → a large prospective cohort found NO increased risk and a statistically significant protective trend for diverticulitis; the avoidance advice was never evidenced and should be dropped.
• "Every attack of diverticulitis needs antibiotics" → for CT-confirmed acute UNCOMPLICATED diverticulitis in stable, immunocompetent patients, two randomised trials show observation is non-inferior and guidelines now endorse selective, not routine, antibiotics.
• "Antibiotics are usually unnecessary for diverticulitis, so I can ride it out" → this de-escalation applies ONLY to uncomplicated disease; complicated diverticulitis (abscess, perforation, obstruction), sepsis or immunosuppression still need antibiotics and urgent assessment. This is the dangerous over-generalisation.
• "Load up on fibre and it'll fix the diverticular symptoms" → fibre is a reasonable PREVENTION lever, but the evidence that it relieves established symptomatic disease or prevents recurrence is very low quality; it is over-promised as a treatment.
• "A fibre supplement means I don't need the follow-up scope" → after a first diverticulitis episode a follow-up colonoscopy is recommended to exclude an underlying colorectal cancer (pooled malignancy yield around 1.9%, rising to roughly 8% in complicated disease); no diet replaces it.
• "Diverticulitis is just a diet problem I can manage myself" → red-flag presentations (high fever, severe or rising pain, inability to tolerate oral intake, rectal bleeding, peritoneal signs, immunocompromise) need medical assessment, not self-management.

This entry owns the nuts-and-seeds debunk, the fibre-for-prevention-not-cure nuance, the selective-antibiotics shift, and the complicated-disease and follow-up-colonoscopy safety net. It defers the general mechanics and dosing of dietary fibre to dietary_fiber_diversity_and_microbiome_health, and the management of the constipation that fibre also targets to constipation_evidence_and_management. It states those boundaries and routes there rather than re-arguing them.

Evidence

Organised by claim, with the tier signal inline. The entry sits at Moderate overall, but the strands split: the two antibiotic RCTs are randomised-grade, the nuts/seeds and colonoscopy findings are large observational, and the fibre-for-established-disease strand is deliberately weak — read the tiers, not just the thesis.

The nuts-and-seeds rule was overturned by prospective data (Moderate, large cohort against a zero-evidence prior).

1. Nut, corn and popcorn consumption did not raise diverticular risk — the trend was protective. In 47,228 men in the Health Professionals Follow-up Study followed 1986–2004 (801 incident diverticulitis and 383 diverticular-bleeding cases), nut, corn and popcorn intake was NOT associated with increased diverticulitis or bleeding, and the highest intake carried a statistically significant INVERSE (protective) trend for diverticulitis. The authors concluded the long-standing avoidance advice "should be reconsidered." This is a large prospective cohort with validated diet questionnaires; it is observational, so residual confounding is possible, but the decades-old restriction it overturned had NO controlled evidence behind it, so the net is a strong upgrade over the prior. (Strate LL, Liu YL, Syngal S, Aldoori WH, Giovannucci EL. "Nut, Corn, and Popcorn Consumption and the Incidence of Diverticular Disease." JAMA 2008;300(8):907–914. NIH/NIDDK-funded prospective cohort; the finding advises eating a cheap snack and sells nothing — cui bono runs clean.)

Antibiotics are not mandatory for uncomplicated diverticulitis — two RCTs (Strong for this specific claim).

2. AVOD: antibiotics neither sped recovery nor prevented complications in uncomplicated disease. 623 patients with CT-verified acute uncomplicated left-sided diverticulitis were randomised to antibiotics (314) versus no antibiotics (309). Antibiotics did not accelerate recovery, prevent complications, or reduce recurrence; complications were 1.0% with antibiotics versus 1.9% without, a non-significant difference. The eleven-year follow-up confirmed durability: recurrence 31.3% in both arms and complications 4.4% versus 5.0%, no difference. For the antibiotic-omission claim specifically this is randomised-grade evidence with long follow-up. (Chabok A, Påhlman L, Hjern F, Haapaniemi S, Smedh K (AVOD trial). Br J Surg 2012;99(4):532–539; eleven-year follow-up Isacson D et al., Br J Surg 2019;106(11):1542. Investigator/academic-funded surgical trial; the finding REDUCES drug use, so the bias direction runs away from the result, not toward it.)

3. DIABOLO: independent replication — no benefit of routine antibiotics. A pragmatic trial across 22 Dutch hospitals (2010–2012) randomised patients with a first episode of CT-proven uncomplicated diverticulitis to observation versus a ten-day antibiotic course. There was no significant difference in median time to recovery, complicated or recurrent diverticulitis, readmission, sigmoid resection, or mortality at twelve months. This is a second independent multicentre RCT converging with AVOD; an individual-patient-data meta-analysis pooling both found no benefit of routine antibiotics. Robust. (Daniels L, Ünlü Ç, de Korte N, et al. (DIABOLO trial). Br J Surg 2017;104(1):52–61; protocol Ünlü Ç et al., BMC Surg 2010;10:23; IPD meta-analysis van Dijk ST et al., Br J Surg 2020. Netherlands Organisation for Health Research (ZonMw), government-funded; again anti-industry in direction.)

The guidelines shifted to match (Moderate, guideline-level synthesis).

4. AGA now endorses selective, not routine, antibiotics — and fibre for prevention only. The AGA Clinical Practice Update (2021) advises that antibiotics can be used SELECTIVELY rather than routinely in immunocompetent patients with mild acute uncomplicated diverticulitis, and separately suggests a fibre-rich diet or fibre supplementation for patients with a HISTORY of acute diverticulitis (i.e. for prevention). Both the selective-antibiotics and the fibre-for-prevention levers trace to this guideline-level synthesis; note that the AGA grades the fibre recommendation as conditional and low-certainty by its own criteria, and confines the selective-antibiotics advice to uncomplicated cases explicitly. (Peery AF, Shaukat A, Strate LL. "AGA Clinical Practice Update on Medical Management of Colonic Diverticulitis: Expert Review." Gastroenterology 2021;160(3):906–911; see also the AGA Institute guideline on management of acute diverticulitis, Gastroenterology 2015. AGA professional society, no commercial angle.)

The follow-up colonoscopy is load-bearing — there is a real cancer signal (Moderate, meta-analytic prevalence + guideline consensus).

5. A first episode warrants a scope because a minority masks a colorectal cancer. Pooled colorectal-cancer prevalence among patients presenting with diverticulitis is around 1.9%, rising to roughly 7.9% in COMPLICATED diverticulitis versus about 1.3% in uncomplicated disease. The AGA advises colonoscopy roughly 6–8 weeks after resolution (in candidates who have not had a recent high-quality examination) to exclude an underlying neoplasm. This is the strongest safety-net claim in the entry: a genuine cancer signal, concentrated in complicated disease. (AGA Clinical Practice Update, Gastroenterology 2021, citing a colorectal-cancer-yield meta-analysis — Clin Gastroenterol Hepatol 2019, 31 studies, 50,445 patients — pooled malignancy 1.9% overall, 7.9% in complicated disease. If anything the commercial incentive here — an extra procedure — cuts toward over-scoping, yet the malignancy yield justifies the scope after a first or complicated episode.)

Fibre for ALREADY-established symptomatic disease is over-promised (deliberately weak — very low quality).

6. The fibre-cures-established-symptoms claim rests on very low-quality evidence. Systematic reviews find that the evidence high-fibre diets relieve symptomatic uncomplicated diverticular disease or prevent recurrent diverticulitis is very low quality — few RCTs, high risk of bias; one review found no qualifying studies on high-fibre prevention of recurrence, and a large colonoscopy study paradoxically linked HIGHER fibre intake to MORE diverticulosis, not less. This is the genuinely weak strand, and it is the both-ways tension made concrete: it separates "fibre for PREVENTION of incident disease" (plausible, moderate) from "fibre treats established symptoms" (very low certainty). (Carabotti M, Annibale B, Severi C, Lahner E. "Role of Fiber in Symptomatic Uncomplicated Diverticular Disease: A Systematic Review." Nutrients 2017;9(2):161; Ünlü C, Daniels L, Vrouenraets BC, Boermeester MA, Int J Colorectal Dis 2012;27:419–427; the fibre-diverticulosis paradox in Peery AF et al., Gastroenterology 2012. Fibre-supplement makers benefit from over-promising here — the honest read is a reasonable prevention lever, not a treatment for established symptoms.)

Mechanism

This entry owns the diverticular-specific evidence and the safety framing, not the general physiology of fibre or the microbiome. The mechanics and dosing of dietary fibre are deferred in full to dietary_fiber_diversity_and_microbiome_health. What follows is only enough mechanism to make the reversals and the guardrails intelligible.

Why the nuts-and-seeds fear never made mechanistic sense. The restriction assumed that a hard food fragment physically lodges in a diverticular pouch and triggers inflammation or bleeding. There was never controlled evidence for this, and the prospective data run the other way — if anything nut and popcorn eaters had fewer diverticulitis events, plausibly because those foods travel with a higher-fibre, less-refined dietary pattern. The mechanism the folk model imagined is not how these pouches inflame; the trigger is thought to be microperforation and localised inflammation of a pouch, not an impacted seed.

Why fibre helps prevention more than established symptoms. A higher-fibre stool is bulkier and moves with lower intraluminal pressure, which is the plausible route by which fibre reduces the formation of new pouches and the incidence of diverticulitis over time (the prevention lever the guideline endorses). But once pouches exist and a segment is symptomatic, adding fibre does not reliably reverse the anatomy or calm established symptoms — which is exactly why the RCT base for fibre-as-treatment is thin and inconsistent, and why the colonoscopy-era data even show more diverticulosis at higher fibre intake in some cohorts. The prevention/treatment split is the mechanism, not a hedge.

Why antibiotics are dispensable in uncomplicated disease but not complicated. The reframing of uncomplicated diverticulitis is that it is often a self-limiting, predominantly inflammatory (not primarily infective) process, so the body clears it without antibiotics in most stable patients — which is what AVOD and DIABOLO demonstrated. Complicated diverticulitis is a different physiological event: a pouch has perforated, walled off into an abscess, or obstructed, and there is now established or threatened infection and a structural problem. That is where antibiotics, imaging, and surgical assessment are load-bearing, and where the de-escalation logic does not transfer.

Why a first episode earns a colonoscopy. Diverticulitis and colorectal cancer can present with overlapping segmental inflammation, and a malignancy can mimic or coexist with a diverticular flare, especially in complicated disease. The follow-up scope after resolution exists to catch the cancer that the acute imaging cannot reliably distinguish — a safety net justified by the pooled malignancy yield, not by the flare itself.

Risks And Contraindications

• The dangerous failure mode is under-treating complicated disease. Antibiotic de-escalation is validated ONLY for CT-confirmed UNCOMPLICATED diverticulitis in immunocompetent, stable patients. It is NOT for complicated diverticulitis — abscess, perforation, or obstruction — nor for sepsis, immunosuppression, or when imaging is unavailable. The entry must never let "antibiotics are often unnecessary" bleed into a complicated presentation, where withholding antibiotics and imaging/surgical assessment is exactly wrong. This is the clinically harmful error the entry exists to prevent.
• The follow-up colonoscopy is a cancer safety net — do not skip it. After a first diverticulitis episode, up to roughly 8% of complicated cases (around 1.9% overall) harbour an underlying colorectal cancer. Skipping the guideline-recommended scope to "just manage it with diet" risks missing a treatable cancer. A fibre supplement is not a substitute for the examination.
• Do not over-claim fibre for established symptomatic disease. Present it honestly: a reasonable PREVENTION lever, but very low-quality evidence for relieving already-symptomatic disease or preventing recurrence. Selling fibre as a cure for a symptomatic patient over-reaches the data (and one cohort even linked higher fibre to more diverticulosis).
• Keep the antibiotic claim inside its conditions. The de-escalation evidence is for CT-confirmed, uncomplicated, stable, immunocompetent patients under clinical care — not a licence to self-treat any abdominal pain as "probably just a mild flare." Diagnosis and the antibiotic decision belong with a clinician. Broader antibiotic-stewardship principles are owned by antibiotics_use_and_stewardship.
• Red-flag boundary (see a doctor, do not self-manage). High fever, severe or rising abdominal pain, a rigid or peritonitic abdomen, inability to tolerate oral intake, rectal bleeding, or immunocompromise all warrant urgent medical assessment. A first suspected episode without a subsequent colonoscopy, and any recurrent or worsening course, warrant clinical review rather than dietary self-management.

Controversy

Nature: a genuine evidence-based relaxation of two old rules (the nuts-and-seeds ban and reflexive antibiotics for uncomplicated flares) entangled with two persistent errors at the opposite pole — over-promising fibre for established disease, and, more dangerously, under-treating complicated diverticulitis or skipping the follow-up colonoscopy. Error lives at both poles.

Position A — "The evidence-based levers reflect real progress." The de-escalation take.
• Best evidence: nuts, seeds and popcorn do not need restricting (a 47,228-man prospective cohort found no harm and an inverse trend); fibre is a reasonable lever for PREVENTING incident diverticulitis; and antibiotics are not mandatory for CT-confirmed acute uncomplicated diverticulitis — AVOD and DIABOLO show observation is non-inferior, and the AGA now endorses selective use. Each holds under its stated condition.
• Where it goes wrong if overstated: it tips into "antibiotics are usually unnecessary" applied to complicated disease, "fibre fixes diverticular symptoms," or "no need for the follow-up scope" — each of which drops a load-bearing safeguard.

Position B — "The opposite errors remain common, and some are dangerous." The guardrail take.
• Best evidence: the outdated nuts-and-seeds fear still gets repeated; fibre for already-established symptomatic disease rests on very low-quality evidence; and the genuinely dangerous failure is under-treating complicated diverticulitis (abscess, perforation, obstruction) or skipping the follow-up colonoscopy that rules out a colorectal cancer (up to ~8% yield after complicated disease).
• Where it goes wrong if overstated: it can slide back into blanket antibiotics for every flare and blanket food restriction — re-imposing the very over-treatment the RCTs and the cohort corrected.

The funding/bias dimension — cui bono, both ways. Toward the reassuring pole: the fibre-supplement market benefits from over-promising fibre for established symptomatic disease — precisely the claim the systematic-review evidence does NOT support. Toward the corrective pole: the two pivotal antibiotic RCTs (AVOD, DIABOLO) were government/academic-funded and their finding REDUCES drug use, the opposite of a pharma incentive, so the de-escalation signal is if anything conservative; the nuts/seeds cohort was NIH-funded and sells nothing; and the extra-procedure incentive around colonoscopy, if anything, cuts toward over-scoping, yet the malignancy yield justifies the scope after a first or complicated episode. The historical error — the nuts-and-seeds ban — was never evidence-based; it was expert-opinion dogma, a clean cautionary case for publication_bias_and_evidence_distortion.

Realised Position: Both positions are true and the safe framing holds all of them at once. Drop the nuts-and-seeds restriction; treat fibre as a modest prevention lever, not a cure for established symptoms; support antibiotic de-escalation ONLY for uncomplicated, CT-confirmed disease in stable, immunocompetent patients under clinical care — and never let de-escalation blur the hard red flags. Complicated diverticulitis needs antibiotics and imaging/surgical assessment, and a first diverticulitis episode warrants a follow-up colonoscopy to exclude cancer. The reassurance is real; the guardrails are not optional.

Cross-Pillar Connections

This is a cross-pillar topic: the levers span diet (fibre), pharmacology (antibiotic stewardship), and the evidence-literacy of a reversed clinical dogma.
• Diet (dietary_fiber_diversity_and_microbiome_health): owns the mechanics, dosing and microbiome effects of dietary fibre; this entry holds only the diverticular-specific prevention-not-cure nuance and defers the general fibre physiology there.
• Gut/GI (constipation_evidence_and_management): owns the evidence and management of constipation — the low-pressure-stool goal that fibre also serves; this entry routes there rather than re-arguing bowel-transit management.
• Pharmacology/stewardship (antibiotics_use_and_stewardship): owns the general principles of appropriate antibiotic use; this entry holds only the diverticulitis-specific selective-versus-routine finding and its hard limit at complicated disease.
• Evidence method (publication_bias_and_evidence_distortion): the nuts-and-seeds ban is a clean case study of expert-opinion dogma persisting without controlled evidence, and being overturned by a prospective cohort.

What would change our mind

Falsifiability: explicit upgrade/downgrade criteria from source

• We'd narrow the antibiotic-de-escalation window if a large RCT or individual-patient-data meta-analysis showed that observation increases perforation, abscess or mortality in a subgroup of uncomplicated patients. The current signal is non-inferiority with slightly higher but non-significant complication rates in the no-antibiotic arms — a genuinely watched caveat, not a settled null.
• We'd reopen the nuts-and-seeds question only on a mechanistic or RCT-level signal of harm, but 18-year prospective data make that very unlikely.
• We'd downgrade the fibre-for-prevention lever if a well-powered RCT showed fibre does NOT reduce incident diverticulitis. (The fibre-cures-established-symptoms claim is already held at very low certainty and would need clean RCT support to move up.)
• We'd relax the routine post-episode colonoscopy for a subgroup if newer data showed that the cancer yield after a strictly uncomplicated first episode is no higher than baseline screening yield — some guidelines already trend cautiously this way. We would NOT relax it after complicated disease, where the yield is highest.
• What would NOT move us: that complicated diverticulitis needs antibiotics and assessment, or that a first episode earns a scope. Across all of it, independent (non-seller) funding is the decisive variable, and the load-bearing claims already have it.

Industry bias note

Structural incentives the evidence base may reflect

Cui bono runs in multiple directions, and the reassuring reversals are notably clean.
• The antibiotic RCTs run against drug interest. AVOD (investigator/academic) and DIABOLO (government-funded, ZonMw) both found routine antibiotics unnecessary for uncomplicated disease — a finding that REDUCES drug use, the opposite of a pharma incentive. That makes the de-escalation signal conservative, not inflated, and it is the strongest reason to trust it.
• The nuts/seeds cohort sells nothing. The Strate 2008 Health Professionals Follow-up Study was NIH/NIDDK-funded and its practical upshot is "eat a cheap snack." There is no commercial party who profited from overturning the restriction, which is why the reversal is credible.
• Fibre supplementation is the one place commercial incentive pushes the wrong way. Fibre-supplement makers benefit from over-promising fibre for established symptomatic disease — exactly the claim the systematic-review evidence does NOT support. This is why the entry keeps fibre-for-symptoms at very low certainty and frames fibre as prevention, not cure.
• The colonoscopy incentive cuts toward over-scoping, yet the scope is justified. A naive "extra procedure = revenue" read would predict over-recommending colonoscopy; here the malignancy yield (up to ~8% after complicated disease) independently justifies the post-episode scope, so the recommendation survives the cui-bono test rather than depending on it.
• The historical error was dogma, not evidence. The nuts-and-seeds ban was expert-opinion inertia with no controlled backing — a clean cautionary case for publication_bias_and_evidence_distortion. Net: the load-bearing claims are publicly/academically funded and frequently run against the relevant industries — the favourable cui-bono pattern.

Diverticular Disease: The Nuts-and-Seeds Rule Was Wrong, and Not Every Flare Needs Antibiotics