Alcohol and colorectal cancer risk: How your drinking habits play a role

Emerging research suggests that long-term alcohol consumption, especially heavy drinking, may increase the risk of developing colorectal cancer (CRC). While drinking alcohol doesn’t guarantee someone will develop cancer, understanding how lifestyle choices influence risk can help patients make informed health decisions.

What is colorectal cancer?

CRC is cancer that begins in the colon or rectum. It’s one of the most common cancers worldwide, but it’s also one of the most preventable when caught early through screening and healthy lifestyle choices. Common CRC risk factors include:

• Age
• Family history and genetics
• Diet and physical activity
• Smoking history
• Alcohol consumption habits

The latest findings about alcohol and CRC risk

Researchers followed 88,092 adults over two decades to understand how long-term drinking patterns affect cancer risk. During the twenty years when study participants were assessed, 1,679 participants developed CRC. The study’s authors found that heavy drinking was linked to a higher risk of developing cancer.

Heavy weekly drinking increases cancer risk

People who averaged 14 or more alcoholic drinks per week had a higher overall risk of CRC compared with light drinkers (e.g. those who drank one drink or less per week). The risk appeared especially elevated for rectal cancer.

Duration of drinking patterns matters

Consistently heavy drinking across adulthood was associated with significantly higher cancer risk compared with people who drank very little over time.

It’s not too late to reduce your risk

According to the study, former heavy drinkers didn’t have higher CRC risk compared with light drinkers. Researchers also observed fewer precancerous colon growths among people who stopped drinking, suggesting risk may decline after quitting.

Why does alcohol increase the risk of cancer?

There are several reasons why alcohol can increase the risk of cancer, including:

• Alcohol contains ethanol, which the body then breaks down into acetaldehyde, a chemical which is a known carcinogen
• Alcohol may reduce the body’s ability to properly absorb nutrients and increase inflammation in the digestive tract
• Alcohol can affect hormone levels, including estrogen that can contribute to abnormal cell division
• Alcohol use can lead to weight gain, and weight can be a contributing factor to cancer risk
  

How should you adjust your drinking in light of this latest data?

If you drink alcohol, this research offers some practical takeaways:

• Long-term heavy drinking may increase CRC risk
• Cutting back—or quitting—may help reduce risk over time
• Even small lifestyle changes can support long-term health
• Regular screening remains one of the most effective cancer prevention methods
  

Current guidelines recommend many adults begin CRC screening around age 45, though your doctor might recommend earlier screening based upon personal risk. If you have a history of heavy drinking, talk to your doctor about screening. 

While not all cancers can be prevented, patients can take steps to support colon health:

• Limit alcohol intake
• Eat a fiber-rich diet with fruits and vegetables
• Stay physically active
• Avoid smoking
• Maintain a healthy weight
• Talk with a healthcare provider about screening options
  

Long-term drinking habits may influence CRC risk, particularly if you have been a heavy and consistent drinker over many years. The good news: reducing alcohol consumption and staying up to date on screenings are proactive steps that may help protect your health. Always speak with your healthcare provider if you have any concerns about your risk.

Remember that you can always reach out to an oncology nurse practitioner at Outcomes4Me to help you better understand your diagnosis and risk factors.