Nightly junk food can keep the rectum inflamed
A proctitis diet case that explains two years of blood and mucus in the stool. Antonis's case shows how a nightly junk food habit and a depleted gut may keep the rectum inflamed, and why diet came first in his plan.
Antonis's casecase study
Antonis is 39 years old and had a two-year history of blood in the stool, at first put down to hemorrhoids. Over time, his bowel movements increased to four or five a day, with blood appearing after the fourth movement and occasional mucus. A colonoscopy confirmed chronic proctitis, a diagnosis that is uncommon at his age. His history included a steady, nightly habit of ultra-processed and fried food (junk food), along with excess body weight.
In the evaluation, we decided to look at what was driving the inflammation with a full molecular stool test. The test revealed a depleted gut microbiome, low Akkermansia muciniphila and raised fecal calprotectin, an inflammation marker that stayed hidden on routine bloodwork. This proctitis diet case describes how his diet and his lab results came together, and why cutting junk food became the first step in his plan.
Proctitis diet case: who is Antonis and what symptoms did he have?
Antonis, 39 years old
Antonis came to the practice where I work as a scientific collaborator with a two-year history of blood in the stool. At first, the symptom was put down to hemorrhoids. As the bleeding continued, a colonoscopy found chronic proctitis, a diagnosis that at this age led us to look deeper for a cause.
Four to five bowel movements a day
His bowel movements reached four to five a day, with blood appearing consistently after the fourth movement and occasional mucus in the stool. He also reported bloating after meals, two episodes of hives and frequent nasal congestion, findings that seemed unrelated to each other at first glance. A different side of persistent bloating appears in Marios's case.
A routine built around junk food
He woke at 4:30 am and trained on an empty stomach, ate a salad for lunch and a light meal in the afternoon. Dinner, however, was ultra-processed or fried food almost every night, before he went to sleep around 9 pm. This steady, daily exposure to junk food stood out immediately in his history.
Weight, medication and family history
His body mass index was around 30.5, at the edge of obesity. He was taking finasteride and minoxidil long term, had a family history of stomach ulcer and was already being treated with mesalazine and a probiotic formula. None of these factors on their own explained why proctitis appeared so early.
What caught our attention about proctitis this early?
What caught our attention in Antonis's case was his age. Chronic proctitis is more common in older people or in people who already have inflammatory bowel disease. At 39, with no history of bowel disease, this inflammation led us to look for what might be keeping it active for so long.
His diet history stood out
His history stood out for a steady, nightly habit of junk food, combined with excess body weight. Research links regular intake of ultra-processed food with a higher risk of inflammatory bowel disease, through mechanisms tied both to the food's components and to how it is processed.1 This led us to treat his diet as a likely driver of the inflammation.
Looking beyond routine bloodwork
The next step was to look past routine bloodwork, which often stays normal even when the gut is actively inflamed. We recommended a full molecular stool test, with gut microbiome markers and markers of the gut lining, such as fecal calprotectin and secretory IgA, to see what was behind the proctitis diagnosis.
Can junk food cause proctitis on its own?
In the relationship between proctitis and diet, junk food places a burden on the gut lining through advanced glycation end products, emulsifiers and a high sugar content, factors that have been linked with a more permeable gut and low-grade inflammation. In a gut already under strain from other factors, a steady diet of junk food can act as an accelerant for inflammation, although it is rarely the only cause.
Which first steps did we recommend, and why?
Before the stool test results came back, Antonis's history already gave us enough to recommend immediate changes. Our thinking rested on how long-term junk food intake affects the gut lining, independent of the findings that would come later.
Junk food as the main direction
We recommended cutting back on junk food as the first priority. Fried and ultra-processed foods contain advanced glycation end products (AGEs) and polycyclic aromatic hydrocarbons (PAHs) formed during high-heat frying, monosodium glutamate (MSG) and emulsifiers widely used in industrial food processing, along with a lot of sugar. In a large cohort, people who ate one to four servings of ultra-processed food a day had a 67% higher risk of inflammatory bowel disease, and those who ate five or more had an 82% higher risk, compared with less than one serving a day.1
Ultra-processed food intake and inflammatory bowel disease risk
Narula 2021, prospective cohort with a median follow-up of 9.7 years, compared with less than 1 serving a day.1
These figures reflect overall inflammatory bowel disease risk in a large population, and they showed us why his daily exposure to junk food belonged at the center of his history. The effect of ultra-processed food on the young is discussed in ultra-processed foods and children's brains.
Why we singled out emulsifiers
One ingredient we singled out was polysorbate-80, an emulsifier commonly used in processed food. In a study across Australia, Hong Kong and China, people with Crohn's disease had eaten more processed food and had a higher recent intake of polysorbate-80 and other additives than healthy controls.2 The mechanism behind this difference involves how polysorbate-80 is handled in the gut and how that affects the permeability of the gut barrier.
The rest of the initial plan
Alongside cutting junk food, we recommended gradual weight loss of at least 10 kg, less alcohol and no exhausting workouts on an empty stomach, since intense physical strain without enough fuel can add further strain to the digestive system. We also recommended regular, measured meals at consistent times, seasonal vegetables, soup two to three times a week and a sodium butyrate supplement, a short-chain fatty acid that directly feeds colon cells.
A possible shared starting point with the hives
We also singled out the two episodes of hives in his history. Hives and gut inflammation might share an immune background in some cases, so we viewed the skin and the gut as two possible expressions of one broader inflammatory picture.
What did the full stool test show?
The stool test came back and explained why the inflammation stayed active despite treatment with mesalazine. The findings combined fewer beneficial bacteria, signs of gut dysbiosis and inflammation markers of the gut lining that earlier bloodwork had not picked up.
The species that lives in the mucus layer and feeds colon cells with acetate and propionate was reduced, a finding often linked with a weaker mucus barrier.3 Its role is also discussed in Michael's diabetes case.
An opportunistic bacterium in overgrowth, a finding that typically comes with low levels of beneficial species such as Akkermansia.
Secretory IgA is the gut lining's first line of defense against pathogens and toxins, and low levels leave the lining more exposed.4
A direct marker of active inflammation in the gut lining, confirming that the proctitis remained active despite the existing treatment.5
A marker of an immune reaction to gluten, separate from celiac disease, which led us to recommend a modified, lower-gluten diet.6
A negative result that ruled out an active infection as the cause of the symptoms and turned our attention toward dysbiosis and diet.
Not directly related to the proctitis, but it shapes which treatment would make sense if eradication were ever needed.
An overall picture of gut dysbiosis that goes with the low Akkermansia and raised fecal calprotectin.
What does low Akkermansia muciniphila mean on a stool test?
Akkermansia muciniphila is one of the main bacteria that live in the mucus layer of the colon and help keep the gut lining healthy. Low levels of this species have been linked with changes in the mucus layer and with ulcerative colitis.3 In a case like this, a low level adds to the picture of inflammation when it appears together with other markers, such as fecal calprotectin.
How the findings connect to his diet
These findings match Antonis's diet history. A steady diet of junk food, low in fiber and high in processed ingredients, creates a gut environment that favors opportunistic bacteria over species like Akkermansia, while keeping the inflammation of the gut lining active. The depleted gut microbiome and raised fecal calprotectin gave us a specific explanation for why the proctitis appeared so early and why it persisted.
| Intervention | Which finding it targets, and why |
|---|---|
| Sodium butyrate, a short-chain fatty acid supplement | For the low Akkermansia muciniphila and the depleted gut microbiome. It directly feeds colon cells and supports the gut lining.3 |
| A broad-spectrum herbal antimicrobial blend (goldenseal, garlic, tea tree and oregano extracts) | For the Enterobacter overgrowth on the dysbiosis panel. It targets opportunistic bacteria without the broad effect of an antibiotic. |
| A modified, lower-gluten diet (a Mediterranean pattern with fewer gluten-containing grains) | For the raised anti-gliadin antibodies. It reduces a possible dietary trigger without a full gluten exclusion. |
| Seasonal vegetables and soup instead of junk food | For the raised fecal calprotectin and low secretory IgA. It reduces exposure to glycation products, emulsifiers and sugar that burden the gut lining.1 |
| Gradual weight loss of at least 10 kg and less alcohol | For the raised body mass index and the metabolic strain that keep low-grade inflammation active throughout the body. |
Every case is different, so Antonis's plan describes his care and is not a plan for anyone else. Proctitis needs ongoing care from a gastroenterologist, and his mesalazine treatment stayed with his doctor.
What did Antonis's case teach us about proctitis and diet?
Antonis's case showed how a steady junk food habit can be linked with chronic proctitis at a young age, with no other obvious cause. The full stool test found the link that routine bloodwork missed: low Akkermansia muciniphila, gut dysbiosis, low secretory IgA and raised fecal calprotectin.
Next steps
We recommended repeating fecal calprotectin two months after the start of the plan, to see whether the inflammation eases alongside the diet changes. We also recommended full follow-up with his gastroenterologist and age-appropriate screening, since his family history of stomach ulcer keeps the broader digestive picture worth watching. At the time of this case, the repeat test was still ahead.
How junk food affects the gut lining
In Antonis's case, diet stood out as the starting point for understanding why the proctitis appeared so early, and for how it could be addressed at the root.
Frequently asked questions
Chronic proctitis is long-lasting inflammation of the lining of the rectum, the last part of the large intestine. It often causes blood in the stool, mucus and more frequent bowel movements, and it is often first mistaken for hemorrhoids because the bleeding looks similar. It can be linked with inflammatory bowel disease, infection or dietary factors.
There is no single proctitis diet, and diet supports medical treatment rather than replacing it. In Antonis's case, the plan cut junk food, added seasonal vegetables and soup, lowered gluten and set regular meal times. Research links ultra-processed food with a higher risk of inflammatory bowel disease.1
Beyond the colonoscopy that confirms the diagnosis, a molecular stool test adds information about the gut microbiome, dysbiosis and inflammation markers such as fecal calprotectin, details that routine bloodwork usually leaves out.5
References
6 studies
- Narula N, Wong ECL, Dehghan M, et al. Association of ultra-processed food intake with risk of inflammatory bowel disease: prospective cohort study. BMJ. 2021.
- Trakman GL, Lin WYY, Hamilton AL, et al. Processed food as a risk factor for the development and perpetuation of Crohn's disease: the ENIGMA study. Nutrients. 2022.
- Earley H, Lennon G, Balfe Á, et al. The abundance of Akkermansia muciniphila and its relationship with sulphated colonic mucins in health and ulcerative colitis. Sci Rep. 2019.
- Lin R, Chen H, Shu W, et al. Clinical significance of soluble immunoglobulins A and G and their coated bacteria in feces of patients with inflammatory bowel disease. J Transl Med. 2018.
- Rokkas T, Portincasa P, Koutroubakis IE. Fecal calprotectin in assessing inflammatory bowel disease endoscopic activity: a diagnostic accuracy meta-analysis. J Gastrointestin Liver Dis. 2018.
- Frehn L, Jansen A, Bennek E, et al. Distinct patterns of IgG and IgA against food and microbial antigens in serum and feces of patients with inflammatory bowel diseases. PLoS One. 2014.
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Cite this article
Prevedoros, T. (2026, September 2). Nightly junk food can keep the rectum inflamed. Gut Pathways. https://gutpathways.com/case-studies/proctitis-diet-junk-food/
