Doctor warns about growing cases of colon cancer among young adults and recommends 4 fruits to reduce the risk

A healthy gut is described as the foundation of overall well-being. What many don’t realise is that the foods eaten daily directly influence the gut microbiome, a community of good bacteria that protect against inflammation and diseases like colon cancer. As per a study published in ScienceDirect, it is estimated that 3.2 million new cases of colorectal cancer would occur worldwide in 2040 due to population expansion, ageing, and human development.
Dr Saurabh Sethi, a Harvard-trained gastroenterologist, recently shared that certain fruits are especially beneficial for the colon. They are not just rich in vitamins or fibre but also packed with compounds that actively reduce inflammation, support digestion, and may protect cells from cancerous changes.

Oranges, lemons, and grapefruits are not just refreshing; they are natural detoxifiers. Dr Sethi points out that citrus fruits are loaded with flavonoids and vitamin C, which help neutralise harmful free radicals in the gut. These antioxidants lower oxidative stress, one of the main triggers for cell damage leading to cancer.

​Study published in the NIH have shown that citrus fruit compounds like hesperidin and naringenin can inhibit the growth of colon cancer cells. Beyond that, the soluble fibre in citrus fruits nourishes gut bacteria, helping maintain a balanced microbiome.

Kiwi often flies under the radar, but it’s one of the most gut-friendly fruits, according to Dr Sethi. This small green fruit contains actinidin, a natural enzyme that helps break down protein and improve digestion.

​Research from the NIH suggests that kiwis can promote bowel regularity and reduce constipation, a factor linked to colon cancer risk. The fruit also contains a unique mix of antioxidants and prebiotics that strengthen the intestinal barrier, reducing inflammation and potential cancer-causing damage.

“An apple a day keeps the doctor away” may sound old-fashioned, but it holds scientific truth. Dr Sethi highlights apples for their rich pectin content, a type of soluble fiber that acts as food for gut bacteria. When fermented in the colon, pectin produces short-chain fatty acids (SCFAs) such as butyrate, which are known to protect colon cells from becoming cancerous.

A study in Frontiers noted that regular apple consumption could lead to a healthier gut environment, reducing harmful bacteria while boosting beneficial ones. The peel, in particular, contains quercetin, a powerful antioxidant that helps prevent DNA damage in cells.

Dr Sethi often emphasises that good gut health isn’t just about fibre; hydration plays an equally important role. Watermelon, with over 90% water content, keeps the colon hydrated and supports smooth digestion.

But there’s more beneath the surface. Watermelon contains lycopene, a potent antioxidant also found in tomatoes, which has been studied for its anti-cancer properties. Research from the NIH has linked lycopene intake to a lower risk of certain cancers, including colon cancer. The fruit’s natural sweetness and hydrating effect make it an excellent summer ally for digestive health.

Colon cancer often begins quietly, developing over years. While no single food can prevent it entirely, Dr Sethi’s recommendations show how everyday fruits can play a vital role in long-term gut protection. Adding these four to the plate doesn’t just nourish the body; it builds a stronger defense system from within.

This article is based on insights shared by Dr Saurabh Sethi, a US-based gastroenterologist, and existing scientific research. It is intended for informational purposes only and should not replace medical advice. Individuals with medical conditions should consult their healthcare provider before making dietary changes.

To keep colon cancer at bay, consume a healthy diet

Keep your colon healthy to keep cancer at bay. This can be done through the right diet, and exercise. A fiber-rich diet, regular physical activity, maintaining a healthy weight, and limiting red and processed meat intake can significantly reduce risk.

1. Changes in bowel habits: Persistent diarrhea, constipation, or narrowing of stools.

2. Blood in stool: Bright red or very dark stools.

3. Abdominal discomfort: Cramping, gas, or pain.

4. Unexplained weight loss: Losing weight without trying.

5. Fatigue: Feeling weak or unusually tired due to anemia or other effects.