Harvard-trained gut doctor eats these 4 foods every day to lower his colon cancer risk

Digestive health is closely connected to everyday eating habits, with growing research examining how diet, gut bacteria and inflammation may influence long-term disease risk. What we put on our plates can shape the gut microbiome while providing nutrients that support normal bowel function. Simple dietary choices may therefore play a role in maintaining overall colorectal health. Harvard-trained gut doctor Dr Saurabh Sethi recently shared four foods and drinks he personally consumes every day, highlighting their potential benefits for gut health and colorectal cancer risk.

Calcium-rich foods

Dr Sethi includes a calcium-rich food such as yoghurt or dahi. Research has linked higher dietary calcium intake with a lower risk of colon cancer, while the World Cancer Research Fund says dairy consumption is associated with decreased bowel cancer risk. Yoghurt also provides live cultures, although its cancer-prevention effects should not be considered guaranteed.

Berries for gut bacteria

Berries are another regular choice because they combine dietary fibre with polyphenols, plant compounds that interact with gut microbes. Research suggests berry polyphenols can influence the composition and activity of intestinal bacteria, while fibre helps nourish beneficial microbes. These effects may support a healthier gut environment, although more human research is needed.

Fibre at every meal

Making fibre a priority means regularly choosing foods such as avocado, seeds, nuts, beans and oatmeal. Fibre is strongly associated with lower colon cancer risk, according to the World Cancer Research Fund. It can also be fermented by gut bacteria to produce short-chain fatty acids, including butyrate, while helping increase stool bulk.

Coffee

Coffee rounds out Dr Sethi’s daily list. It contains polyphenols and several other bioactive compounds, and observational studies have explored whether drinking coffee is associated with reduced colon cancer risk. However, the evidence remains mixed: some meta-analyses report a protective association, while others find no clear relationship. Coffee should therefore be viewed as one dietary habit, not cancer prevention.

While no single food can prevent colon cancer, everyday dietary choices can contribute to better gut and overall health. Including calcium-rich foods, berries, fibre-rich ingredients and coffee may offer potential benefits based on existing research. Alongside regular screening, exercise and other healthy habits, these simple choices can form part of a balanced approach to colorectal health.