Colon cancer, also referred to as colorectal cancer, is the most common type of cancer in the world. Other things that cause colon cancer include genetics, lifestyle and diet. Researchers have lately come out indicating that gut bacteria may be an important factor too. This article will discuss gut bacterial infections and colon cancer, identify particular species of bacteria associated with the disease, explain mechanisms whereby these infections might contribute to cancer, outline dietary measures to manage gut health and consider preventive measures against cancer caused or contributed by bacterial infections.
Which bacteria in the gut cause colon cancer?
Research has found many bad bacteria in the gut which are associated with an increased risk of colon cancer. Some of the most relevant ones include:
- Escherichia coli (E. coli): Several strains of E. coli produce the β-glucuronidase enzyme that promotes the development of cancer. Such strains may contribute damage to intestinal mucosa and might cause inflammation leading to carcinogenesis.
- Bacteroides Fragilis: It has been associated with IBD and is known to cause toxins that can lead to DNA damage in cells, and this might be a contributing factor to cancer growth.
- Fusobacterium Nucleatum: This bacterium has been one of the few ones that have been identified to occur at a higher density in the intestines of patients with colorectal cancer. It can stimulate inflammation and interrupt normal cell-signalling pathways that may induce the growth of tumours.
- Enterotoxigenic Bacteroides Fragilis (ETBF): It is a form of Bacteroides fragilis, that produces a toxin which causes inflammation and encourages tumour growth in the colorectal region.
- Clostridium Septicum: Although Clostridium septicum infection is relatively rare, there have been some cases of people with predisposing conditions who contracted this infection with subsequent colorectal cancers.
How does gut bacterial infection lead to colon cancer?
The relationship between gut bacteria and colon cancer is complex, involving many mechanisms:
1. Chronic inflammation
Chronic infections and dysbiosis (imbalance in gut bacteria) can cause chronic inflammation in the gut. This inflammation has long been known to contribute to cancer because it leads to cellular damage and creates an environment that favours the growth of tumours. Cytokines as well as other inflammatory mediators induce mutations and help in the proliferation of affected cells.
2. Carcinogenic product formation
Some of the gut bacteria produce carcinogenic compounds during fermentation. For example, some metabolites of bile acids and other compounds have been reported as products of bacterial metabolism and are known to be associated with increased colon cancer incidence.
3. Disruption of gut barrier function
Bacterial infections compromise the intestinal barrier, and because of that many toxins and bacteria may enter the bloodstream. Such an effect can produce systemic effects on inflammation, further compromising the intestinal lining and increasing the risk for malignant transformations.
4. Regulation of immune response
Microorganisms of the gut flora play a critical role in modulating the immune system. Abnormal gut microbiota can impair cell-mediated surveillance, allowing neoplastic cells to escape the immune surveillance system.
5. Genomic and epigenomic modifications
Certain harmful bacteria can cause changes in the host cells either at the genomic or epigenomic level. For instance, bacterial toxins directly damage the DNA or disrupt normal cellular signaling pathways which allow cells to grow in an unregulated manner.
How to fix bacterial infection in the gut with diet?
The gut microbiome composition is largely determined by diet. Here are some dietary strategies that help rebalance the good bacteria in your gut and incidentally lower the risk of colon cancer:
Increase dietary intake of fibre
Types of Fibre: You should consume both soluble (oats, apples, beans) and insoluble fibre (whole grains, nuts, vegetables).
Prebiotics: Foods high in prebiotics include garlic, onions, leeks, asparagus, and bananas. They help feed the good bacteria and stimulate their growth.
Incorporate probiotic-rich foods
Fermented Foods: Include yoghurt, kefir, dhokla, idli, sauerkraut, kimchi, and kombucha to introduce healthy bacteria into the gut.
Probiotic Supplements: If you are not consuming enough dietary probiotics, use a good quality supplement, ideally in combination.
Reduce sugar and processed foods
Reduce Sugar Intake: Refined white sugar consumption allows bad bacteria to grow. Limit sugary junk foods, soft drinks, or processed foods.
Avoid Artificial Sweeteners: They tend to upset gut bacteria balance, so it is a good strategy to reduce or completely avoid them.
Focus on whole foods
Nutrient-dense Foods: Focus on whole foods-not processed or packaged-for the most part that are rich in fruits, vegetables, whole grains, nuts, and seeds.
Healthy Fats: These include those containing omega-3 fatty acids like oily fish, flaxseeds, and walnuts which reduce inflammation.
Hydrate adequately
Drink Enough Water: It helps in digestion and keeps the mucosal lining of the gut in proper health.
Limit red meat and high-fat dairy
Avoid High-fat Proteins: Red and processed meats can foster inflammation and may interfere with your gut bacteria balance. Stick to lean proteins, such as chicken, fish, or plant-based.
Avoid gluten if sensitive
Monitor Gluten Intake: If you think you’re sensitive to gluten or have conditions such as celiac disease, you may want to limit or even avoid gluten-containing foods.
Mindful eating
Slow Down and Chew Well: Eat slowly and chew your food well so that your body can digest it much better and reduce the stress that your gut has to undergo in processing.
These simple dietary changes can greatly benefit the gut, and any changes implemented would alleviate infections that are caused by bacteria. Nonetheless, severe and chronic infections should be treated medically; hence a professional should be consulted.
Can colon cancer due to bacterial infection be prevented?
Although colon cancers are preventable only if they are detected at an early stage yet, certain measures help minimise the risk of occurrence, especially those caused by bacterial infection:
1. Regular screening
A colonoscopy is a screening procedure that ensures precancerous polyps or early-stage development of cancer. So early detection is the key to treatment.
2. Healthy diet
A diet rich in dietary fibre, probiotics, and prebiotics but low in processed foods and sugars will help promote gut balance, which might even act as a health tool against some cancers.
3. Use antibiotics wisely
Antibiotics kill bacterial infections but can uproot the overall gut balance if used excessively. The use of antibiotics should be kept to a minimum when necessary.
4. Control inflammatory diseases
IBD conditions increase the risk of colon cancer. Treatment of these conditions can be treated by drugs, diet, and lifestyle.
5. Maintain a regular level of exercise
Exercise helps in the proper functioning of the gut microbiome and thereby decreases the possibility of colon cancer. However, exercise for at least 150 minutes per week at moderate intensity is necessary.
6. Avoid smoking
Smoking is one of the major risk factors for many cancers, one of which is colon cancer. Quitting smoking will decrease this risk factor.
7. Monitoring symptoms
Monitoring the symptoms like any other alteration of bowel function, weight loss that may not be accounted for or blood in stool will lead to early diagnosis and prompt treatment.
Conclusion
Gut bacterial infections and colon cancer are potently interlinked by several mechanisms: inflammation, genetic changes, and immune response modulation. Some pathogens are infamous to increase the risk of colon cancer. However, dietary and lifestyle interventions can potentially minimise this risk. With a properly balanced diet, periodic check-ups, and a lifestyle with healthy choices, one can proactively encourage the gut to move towards a healthier state.
While exploring the connection between gut health and cancer, it’s important to consider how treatment methods like radiation may affect patients’ well-being. Our article on the pain associated with radiation therapy provides valuable context.
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