People who have been heavy drinkers for years may discover their colon is keeping score. New research is drawing a clearer line between long-term, heavy alcohol use and colorectal cancer risk. The findings are a strong reminder that it’s never too late to change course.
Research published recently in the journal Cancer revealed heavy drinkers – defined as those who consume more than 14 drinks a week – had a 95% higher risk of developing rectal cancer and a 25% higher risk of developing colorectal cancer than those drinking zero or one drink a week.
“With the universal prevalence of alcohol use and colon cancer rates on the rise in younger individuals, we’re really looking for any potential association to hopefully decrease the overall risk for the future,” said Marianne V. Cusick, MD, a colorectal surgeon at UT Physicians Colon & Rectal Clinic – Texas Medical Center.
Cusick said it’s not only how much you drink, but also how long you’ve been drinking heavily, that increases risk. A decades-long habit carries more danger than either the amount or duration alone.
“It’s the two combined, which is why making changes now could actually help your future self,” she said.
What alcohol actually does to your colon
There are two primary ways alcohol is thought to damage the colon over time, Cusick said. One is more direct: Alcohol breaks down into chemicals that can damage colon cells and their DNA.
“When DNA gets damaged, cells can lose their ability to self-destruct, which is a natural safeguard against cancer. Without it, abnormal cells can grow out of control, leading to polyps and, eventually, cancer,” said Cusick, an associate professor and H. Randolph Bailey, MD, Chair in Colorectal Surgery at McGovern Medical School at UTHealth Houston.
The second pathway involves the gut microbiome – the community of bacteria living in the colon. Alcohol disrupts the healthy bacteria that help protect the colon. When that balance is thrown off, it can trigger inflammation and increase cancer risk.
The good news: change works
The encouraging news is it’s never too late to start making improvements. Lifestyle changes truly matter.
“Quitting or cutting back does reduce risk, and it can normalize over time,” Cusick said. “Even though lifestyle choices have been made, they can still be reversed in regard to colon cancer risk.”
Cusick emphasized that alcohol is only one piece of a larger picture. Minimizing smoking and processed foods, staying physically active, and supporting gut health all contribute to lowering your risk.
Don’t skip your screening
No matter your drinking history, screening remains one of the most powerful tools. Current guidelines recommend colonoscopy screenings beginning at age 45 for people of average risk. This was lowered from 50 due to rising cases in younger adults.
“Screening saves lives,” Cusick said. “Colonoscopies not only identify colon cancer but can also be preventive. Removing polyps before they become cancerous is one of the most effective interventions we have.”
There are currently no separate screening guidelines for heavy drinkers, but Cusick said researchers are continuing to study whether that should change.
The bottom line
You don’t have to be perfect to protect yourself. But knowing your family history, staying up-to-date on screenings, and making even small changes to your habits – including how much you drink – can add up to meaningful protection.
“There’s no time like the present to be accountable for your lifestyle modifications, because they do have effects in the future,” Cusick said.