Can Beetroot Cause Diarrhea?
Yes, beetroot can cause diarrhea, particularly when consumed raw or in contaminated form, though this is relatively uncommon and typically associated with specific circumstances rather than being an inherent property of properly prepared beetroot.
Mechanism and Context
Beetroot's effect on bowel movements is actually bidirectional depending on preparation and individual factors:
When Beetroot May Cause Diarrhea:
Contaminated raw beetroot is the primary culprit. A Finnish outbreak investigation documented 7 separate outbreaks in 2010 where raw grated beetroot caused sudden-onset gastrointestinal illness in 124 people. The illness was characterized by:
- Extremely rapid onset (median 40 minutes after consumption)
- Short duration (median 5 hours)
- Strong association with raw beetroot consumption (relative risk 8.99) 1
The beetroot samples showed poor microbiological quality with high bacterial counts, though no specific pathogen was definitively identified. Beta-hemolytic Pseudomonas fluorescens was detected but its pathogenic role remains unclear 1.
When Beetroot Actually Helps Constipation:
Paradoxically, properly prepared beetroot (juice or cooked) appears to have laxative and prokinetic effects rather than causing diarrhea:
- Beetroot juice significantly improved stool frequency and gastrointestinal motility in constipated rats 2
- Beetroot leaf extract enhanced gut motility and restored normal bowel function 3
- These effects are mediated through antioxidant compounds (polyphenols, flavonoids, betalains) that reduce oxidative stress and inflammation 2, 4
Clinical Implications and Pitfalls:
Key distinction: The gastrointestinal effects depend entirely on:
- Preparation method: Raw vs. cooked/juiced
- Food safety: Bacterial contamination status
- Individual tolerance: Some people may have sensitivity to beetroot's high fiber and nitrate content
Common pitfall: Assuming all beetroot causes diarrhea when the evidence shows contaminated raw beetroot is the problem, while properly prepared beetroot may actually normalize bowel function.
Practical Recommendations:
- Avoid raw beetroot in institutional settings (as recommended by Finnish Food Safety Authority after the outbreaks) 1
- Cooked or properly processed beetroot juice is generally safe and may even benefit gastrointestinal motility
- If diarrhea occurs after beetroot consumption, consider food contamination rather than an inherent property of the vegetable
- For patients with IBS-D, beetroot is not specifically contraindicated in guidelines, though individual tolerance should guide consumption 5
The evidence suggests beetroot itself is not inherently diarrhea-causing; rather, contamination and improper preparation are the actual risk factors.