A Taiwanese nephrologist reveals the top 10 cancer-causing routines—from sleeping with the lights on to sipping scalding tea—and offers simple, life-saving fixes.
Cancer remains the leading cause of death in Hong Kong, with lung, colorectal, and liver cancers claiming the most lives, according to the 2021 Hong Kong Cancer Registry. While genetics account for only 5 to 10 percent of all cancer cases, the vast majority stem from lifestyle, environment, and diet. This means that many cancers are potentially preventable—if we recognize the hidden dangers in our daily routines.
Dr. Hong Yongxiang, a Taiwanese kidney specialist, recently took to social media to unveil a ranking of the top 10 cancer-causing habits. His list, drawn from clinical experience and medical research, highlights seemingly innocuous behaviors that may silently increase cancer risk over time. The doctor also shared a sobering case: a 60-year-old woman who struggled to swallow, lost 8 kilograms in six months, and was ultimately diagnosed with terminal esophageal cancer that had spread to her lungs and liver. Her daily habits? Watching television for hours, sipping rice wine, snacking on pickled foods, repeatedly reheating salty soups, and drinking piping-hot liquids.
The 10 Cancer-Promoting Habits You Need to Know
Dr. Hong’s ranking, based on medical evidence and patient observations, reveals that many common routines are quietly undermining health. Here is the list, from least to most dangerous:
10. Drinking scalding beverages. The World Health Organization has classified drinks above 65°C as a probable carcinogen for esophageal cancer. Hot liquids can repeatedly damage the lining of the mouth and throat. Fix: Let your tea or coffee cool before sipping.
9. Using Styrofoam bowls for instant noodles. When boiling water is poured into Styrofoam, high temperatures can cause the release of potentially carcinogenic chemicals. Fix: Switch to ceramic or glass bowls.
8. Consuming processed meats regularly. Items like sausages, bacon, and ham contain preservatives linked to colorectal cancer. Fix: Limit intake and opt for fresh protein sources.
7. Sleeping with the lights on. Exposure to artificial light during sleep disrupts melatonin production, a hormone that helps regulate cell growth and may suppress tumors. Fix: Use blackout curtains or a sleep mask.
6. Eating deep-fried foods frequently. High-temperature cooking creates acrylamide, a compound classified as a probable human carcinogen. Fix: Choose baking, steaming, or air-frying instead.
5. Drinking sugary beverages daily. Excess sugar consumption fuels obesity and inflammation, both risk factors for multiple cancers. Fix: Replace sodas with water or unsweetened tea.
4. Sitting for prolonged periods. A sedentary lifestyle is linked to higher rates of colon and endometrial cancers. Fix: Stand up every 30 minutes and incorporate walking breaks.
3. Consuming alcohol regularly. Alcohol is a Group 1 carcinogen, directly linked to cancers of the mouth, throat, liver, and breast. Fix: Limit intake to one drink per day for women and two for men—or abstain.
2. Smoking or exposure to secondhand smoke. Tobacco remains the single largest preventable cause of cancer worldwide. Fix: Seek cessation programs and avoid smoky environments.
1. Eating processed and preserved foods daily. Items like cured meats, pickled vegetables, and repeatedly boiled soups contain nitrates and other compounds that damage cells over time. Fix: Prioritize fresh, whole foods and reduce reliance on preserved items.
A Wake-Up Call: The Slow March of Cancer
Medical research confirms that only 5 to 10 percent of cancers are inherited. The rest are shaped by environment and behavior. Crucially, cancer does not appear overnight. The transformation from a normal cell to a malignant tumor typically takes 10 to 20 years. This long latency period offers a window of opportunity: by improving diet, increasing physical activity, and eliminating harmful habits, individuals can potentially reverse or halt the process.
Dr. Hong illustrated this with the story of a 60-year-old woman who lived alone after her husband’s death. She spent her days in front of the television, drinking rice wine, eating pickled snacks, and consuming repeatedly boiled salty soups. She also loved extremely hot soup. Within months, she could no longer swallow solid food. By the time she sought medical help, esophageal cancer had already metastasized to her lungs and liver. Her prognosis was less than six months.
Why Lifestyle Matters More Than Genetics
The doctor emphasizes that only a small fraction of cancers are inherited. The rest are shaped by daily choices. The good news? The transformation from a healthy cell to a cancerous one takes 10 to 20 years. This long latency period offers a critical chance to intervene. By adopting healthier habits—improving diet, exercising, and reducing stress—individuals can strengthen their immune system and potentially reverse early cellular changes.
Practical Steps to Reduce Your Cancer Risk
Dr. Hong’s advice is straightforward and actionable:
- Let hot drinks cool to below 65°C before drinking.
- Avoid Styrofoam containers for hot foods; use ceramic or glass instead.
- Limit processed meats like ham, bacon, and sausages to occasional treats.
- Sleep in complete darkness to support natural melatonin production.
- Choose whole foods over packaged snacks and sugary drinks.
- Stay active throughout the day, even if it means short walks every hour.
The Bigger Picture: A Preventable Crisis
Cancer remains the top killer in Hong Kong, with lung, colorectal, and liver cancers leading mortality statistics. Yet the medical community agrees that lifestyle changes could dramatically reduce these numbers. Dr. Hong’s message is clear: small, consistent adjustments—like letting your soup cool, turning off the bedside lamp, or swapping instant noodles for a home-cooked meal—can tip the scales away from disease.
For those seeking further guidance, the Hong Kong Cancer Fund offers free resources on diet and prevention. The next step? Start with one change today. Your body’s future may depend on it.