The reasoning was ordinary enough. The bag was about to expire, so he finished it. Within a day, the man in his 70s was at a hospital in Canberra, Australia, with abdominal pain and vomiting, unable to pass gas or move his bowels.
A CT scan showed dilated loops of small bowel and what the radiologist read as ordinary faecalization at the transition point, consistent with an adhesional obstruction. Two days of conservative management failed. He developed evolving peritonitis and went to theater. What his surgeons found, and described in the Journal of Surgical Case Reports, was a firm mass they could palpate through the bowel wall. They opened a healthy segment and delivered roughly 500 milliliters of undigested peanuts. He was discharged on day eight.
A Mass Built Entirely Out of Food
A bezoar is a lump of indigestible material that fails to move through the digestive tract and instead accumulates and compacts. Phytobezoars, made of plant matter such as fiber, skins, and seeds, are the most common type. Trichobezoars are hair. Pharmacobezoars are undissolved medication. Lactobezoars, seen in infants, are milk protein and mucus.
The stomach is the usual site. Cellulose, hemicellulose, lignin, and fruit tannins survive gastric acid, and when the stomach cannot grind or empty them normally, they aggregate. Given enough time, they become genuinely solid.
Persimmons are the notorious culprit. Shibuol, a soluble tannin concentrated in the skin of unripe fruit, reacts with stomach acid and polymerizes into a coagulum that then traps cellulose and protein. The resulting diospyrobezoars are unusually hard and unusually resistant to treatment. Celery, pumpkin, grape peel, prunes, oranges, coconut, sunflower and watermelon seeds and mushrooms all appear in the case literature as well. Peanuts almost never do. The Canberra team identified only two prior published cases and described theirs as the third.
Why This Man and Not Everyone Else
Bezoars account for somewhere between 0.4% and 4% of mechanical intestinal obstructions. The vast majority of people who eat a large bag of peanuts experience nothing beyond regret.
The recognized risk factors are prior gastric surgery, impaired gastrointestinal motility, strictures, hypothyroidism, poor chewing, and a high-fiber diet. This patient had none of the gastric motility problems on that list. What he did have was a complicated surgical abdomen: a cholecystectomy that converted from laparoscopic to open because of significant adhesions, complicated by bleeding that required massive transfusion and two returns to the operating room. His surgeons suspect an adhesion to the anterior abdominal wall created the narrowing where the peanuts conglomerated.
Imaging is not much help on its own. A phytobezoar and retained bowel content look alike on CT, a difficulty radiologists have described explicitly, and misdiagnosis is common. In retrospect, the faecalization on this patient’s scan was the bezoar. That is why several published cases turn on a clinician thinking to ask what the patient had recently eaten.
The Stomach Version Is Often Treated with Soda
Once a mass has passed into the small bowel, the options narrow to surgery. Higher up, the picture is different and considerably stranger.
A systematic review of 24 papers covering 46 patients found that dissolving gastric phytobezoars with Coca-Cola succeeded in 91.3% of cases, either alone in about half of them or combined with endoscopic techniques in the rest. Only four patients in that review went to surgery. The mechanism is thought to involve the beverage’s acidity, near that of gastric acid, along with a mucolytic effect and mechanical help from carbon dioxide bubbles. It works better on some masses than others: initial dissolution succeeded in 60.6% of ordinary phytobezoars but only 23% of persimmon-derived diospyrobezoars.
Where dissolution fails, endoscopists fragment the mass with snares, baskets, or lithotripsy. Surgery remains the fallback for masses too large or too hard to break, and for anything that has already caused perforation or bleeding. When an operation is needed, surgeons generally try to fragment the mass and milk it into the caecum, where it should not re-obstruct, and cut into the bowel only when that is not feasible. A retrospective comparison found the laparoscopic approach safe and effective for selected patients, with a shorter hospital stay.
What This Does and Does Not Mean for Your Diet
Nothing in this literature suggests that eating vegetables, fruit, or nuts is dangerous. Case reports describe events, not rates, and none of these papers measure how often a bezoar follows any particular food.
What they establish is narrower. Someone with a history of stomach surgery, a complicated surgical abdomen, diabetic gastroparesis, or significant dental problems has a real reason to avoid eating a large quantity of fibrous food quickly, and a real reason to mention recent meals if abdominal pain and vomiting develop. Persistent vomiting after meals with unrelenting upper abdominal pain warrants medical evaluation, not a wait-and-see. After a bezoar is treated, clinicians typically advise reduced high-fiber intake and closer attention to chewing, because recurrence follows if the underlying condition goes unaddressed. Anyone in one of these groups with questions about their own diet should take them to a physician rather than adjusting it on the strength of a case report.
Key Questions Answered
What is a phytobezoar?
A compacted mass of indigestible plant material, made of fiber, skins, and seeds, that accumulates in the digestive tract instead of passing through.
How common are they as a cause of obstruction?
Bezoars account for roughly 0.4% to 4% of mechanical intestinal obstructions, making them a rare cause.
Who is most at risk?
People with prior gastric surgery, delayed gastric emptying, strictures or adhesions, hypothyroidism, or difficulty chewing because of missing or ill-fitting teeth.
Does eating fiber cause this?
Not on its own. High-fiber intake is a contributing factor mainly in people who already have impaired gastric grinding, emptying or a narrowed segment of bowel.
Is Coca-Cola really a treatment?
For masses still in the stomach, yes. A systematic review of 46 patients reported 91.3% resolution, alone or combined with endoscopic techniques.
When does someone need surgery?
When the mass has moved into the small bowel, when it is too large or hard to fragment endoscopically, or when it has caused perforation or bleeding.
