Oncologists Share Winter Lifestyle Habits That May Increase Cancer Risk

As the mercury drops, our lifestyles inevitably shift. Winter often brings comfort routines, warm food, less movement, and more time indoors. While these habits feel natural during the cold months, some winter lifestyle choices can quietly increase long-term cancer risk if followed repeatedly year after year. As we approach World Cancer Day 2026, celebrated on February 4, we must remember that prevention is not just about medical screenings; it is about recognising how our everyday routine, especially in winters might be quietly increasing our cancer risk.

To delve into the link between winter living and cancer, the Onlymyhealth editorial team reached out to Dr Niti Raizada, Principal Director - Medical Oncology & Hemato-Oncology at Fortis Hospitals, Bengaluru, and Dr Mandeep Singh, Delhi-based Oncologist and Founder of Art of Healing Cancer. Continue reading to know what both of the doctors shared with us.

Winter Lifestyle Habits With Cancer Risk

Reduced Physical Activity

Cold weather often discourages outdoor movement, leading many to adopt a more sedentary lifestyle. However, this lack of movement has a direct metabolic impact, eventually increasing the cancer risk.

Speaking about the same, Dr Singh explains, "Long hours of sitting and reduced exercise can contribute to obesity and metabolic disorders. Excess body fat is linked to higher risks of several cancers, including breast, colorectal, and pancreatic cancer. Staying moderately active indoors can help counter this risk."

Overconsumption of Processed and High-Fat Foods

Our dietary choices tend to shift significantly as we seek warmth through food, often favouring comfort over nutrition. During the conversation about choosing comfort over health, Dr Raizada underlines, "During winter, many people become less physically active and rely more on calorie-dense comfort foods, leading to weight gain and metabolic changes that are known risk factors for cancers such as breast and colorectal cancer."

Dr Singh notes, "Winter diets often shift toward fried snacks, processed meats, sugary desserts, and comfort foods. Processed meats and foods high in saturated fat are associated with increased risks of colorectal and stomach cancers. Frequent overeating also promotes weight gain, which further raises cancer risk over time."

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Vitamin D Deficiency Due to Less Sunlight

The lack of sun exposure in winter does more than just bring winter blues, as it affects the body's internal protective mechanisms.

Dr Raizada shares that reduced exposure to sunlight during these months can result in Vitamin D deficiency, which may weaken immune surveillance and increase long-term cancer risk."

Dr Singh elaborates, "Shorter days and limited sun exposure during winter can lead to vitamin D deficiency. Vitamin D plays a role in cell growth regulation and immune function. Low levels have been linked to a higher risk of colorectal, breast, and prostate cancers. Lack of sunlight combined with minimal dietary sources worsens the problem."

Increased Indoor Air Pollution

As temperatures drop, fog sets in, and smoke and pollution levels rise significantly. Most Indian cities reach their peak air pollution levels during the winter months, and this pollution is not just an outdoor concern; it affects our indoor air quality as well. While we close our windows to keep the cold out, we may inadvertently be trapping dangerous carcinogens inside our living spaces.

Dr Singh warns, "Spending more time indoors means greater exposure to indoor pollutants such as tobacco smoke, burning wood, coal heaters, incense, and poor ventilation. These pollutants can damage lung tissues and increase the risk of lung and respiratory cancers, especially in poorly ventilated homes."

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Smoking and Alcohol Consumption

Social habits and the desire to stay warm often lead to an increase in substances such as tobacco and alcohol during the festive winter months. Dr Singh points out that winter social gatherings and stress-related habits often lead to increased smoking and alcohol intake.

"Smoking remains one of the strongest risk factors for multiple cancers, including lung, throat, and bladder cancer. Excessive alcohol consumption is linked to cancers of the liver, breast, mouth, and oesophagus," he further adds.

Weakened Immunity and Ignoring Symptoms

One of the biggest risks in winter is confusing a serious symptom with a common cold or seasonal flu. Cold-weather illnesses can weaken immunity, and people may ignore early warning signs like persistent cough, fatigue, or unexplained weight loss, assuming they are seasonal issues. However, Dr Sing advises that these are some of the most visible common and subtle symptoms of any kind of cancer. "Delayed diagnosis reduces the chances of early cancer detection, which is crucial for effective treatment," he further notes.

Poor Sleep and Irregular Routines

The lack of natural light can throw our internal biological clocks out of sync, affecting how our bodies repair themselves. Dr Mandeep Singh adds, "Shorter daylight hours can disrupt sleep patterns and daily routines. Chronic sleep deprivation affects hormone balance and immune surveillance, both of which play a role in cancer prevention." Irregular sleep cycles over time may increase vulnerability to certain cancers.

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Bottomline

Winter habits may seem temporary, but repeated seasonal patterns can have lasting health effects. Maintaining balanced nutrition, staying active, ensuring proper ventilation, and avoiding harmful habits during winter can significantly reduce your cancer risk. As both doctors highlight, small, mindful lifestyle adjustments during colder months can protect long-term health and well-being.