People tend to discuss cancer as either a genetic problem or an occurrence of bad luck, yet scientific research shows that daily life decisions determine cancer risk more than any genetic factors. Our
dietary choices and physical activities are the main factors that determine how our bodies fight inflammation, build immunity, maintain hormonal equilibrium, and repair cellular damage. Dr Rohit Kumar C, Consultant – Surgical Oncology & Robotic Surgery, HIPEC & PIPAC Specialist, Aster Whitefield Hospital, shares how the combination of diet and physical activity functions as the body’s primary defence system, which protects against genetic mutations that result in cancer development.
Understanding Mutations and the Body’s Defence System
The body experiences daily cell division and repair processes, which result in the generation of minor genetic mutations. The immune system effectively removes most of these harmless mutations, which it detects and corrects. The situation becomes dangerous when genetic mutations build up, and the body loses its ability to defend itself. The internal environment that results from chronic inflammation, together with insulin resistance and obesity and oxidative stress creates conditions that enable damaged cells to survive and multiply.
All these processes depend on diet and exercise which either make people more vulnerable or help them build resistance.
How Diet Shapes Cancer Risk
The two main factors that drive cancer development can be controlled through dietary choices. The dietary pattern that includes fruits and vegetables and whole grains and legumes and nuts and seeds delivers antioxidant and phytochemical compounds which protect against DNA damage through their ability to eliminate free radicals. The consumption of dietary fiber provides multiple benefits because it maintains gastrointestinal function and enhances insulin sensitivity while helping to remove possible cancer-causing substances from the body which results in reduced colorectal cancer risk.
The consumption of ultra-processed foods together with refined sugars and unhealthy fats creates a situation that leads to ongoing body inflammation and disrupted hormone levels. The consumption of processed meats which includes sausages, bacon and hot dogs, has been shown to increase the risk of cancer, particularly for colon cancer. People who drink too much alcohol increase their chances of developing breast cancer and liver cancer and mouth cancer and oesophageal cancer.
People need to maintain a healthy body weight through balanced nutrition because excess fat tissue raises estrogen levels and inflammatory markers which both contribute to the development of multiple cancers.
Exercise as a Protective Shield
Physical activity does far more than burn calories. The body uses regular exercise to boost immune surveillance which helps itidentifyand destroy abnormal cells before they become dangerous. Exercise decreases insulin resistance while diminishing blood insulin and growth factor levels which promote cancer cell development.
Studies show that people who engage in regular moderate exercise have a lower risk of cancers such as breast, colon, and endometrial cancer. Movement reduces systemic inflammation while improving hormonal balance which creates an internal environment that prevents cancer development.
The Powerful Synergy of Diet and Workouts
Using diet together with exercise provides better results. The body needs healthy food to support its cellular repair needs and immune system needs while exercise helps with blood flow and metabolic processes and hormone control. The two techniques work together to decrease oxidative damage and maintain blood sugar levels while controlling chronic inflammation which leads to DNA damage and life-threatening genetic mutations.
Muscles become better at glucose uptake through regular exercise which decreases elevated insulin levels that lead to increased cell growth. Nutrient-rich foods provide essential antioxidants and micronutrients which are necessary for the function of DNA repair enzymes.
Building Long-Term Protection, Not Instant Immunity
It is important to recognise that no diet or workout plan can guarantee cancer prevention. Protection is built gradually, through consistency rather than perfection. Small, sustained changes—such as eating more whole foods, reducing processed items, staying physically active, and maintaining a healthy weight—add up over years to significantly lower risk.
Cancer prevention is not about a single superfood or intense fitness routine. It is about creating a body environment that discourages harmful mutations and supports natural repair systems. By combining a balanced diet with regular physical activity, the body becomes better equipped to resist chronic inflammation, control abnormal cell growth, and protect itself against potentially fatal mutations.
