A major new study has found that drinking and cancer risk are more closely linked than previously recognised. Researchers from the University of Sydney and the Australian National University analysed health data from over 225,000 Australians aged 45 and above. Their findings challenge the widely held belief that moderate drinking carries little long-term risk.

The study, published in the British Journal of Cancer, estimated that 7,804 cancer cases in Australia in 2024 were attributable to alcohol use. That is 4.6% of all cancers diagnosed that year, up from 2.8% in 2010 and 4.1% in 2020.

Drinking and Cancer Risk: The Numbers Behind the Link

The cancers most commonly connected to alcohol consumption included:

• Colorectal cancer: 2,084 cases
• Breast cancer: 1,837 cases
• Upper aerodigestive tract cancers (mouth, throat, oesophagus, larynx): 1,808 cases
• Liver cancer: 1,399 cases

These are not rare cancers. Colorectal and breast cancer rank among the most commonly diagnosed in Australia. That is precisely why the connection between drinking and cancer deserves more public attention.

The Risk Grows With Every Drink

There is no safe level of drinking when it comes to cancer. The more a person drinks, the greater their chance of developing an alcohol-related cancer.

For every ten standard drinks consumed per week, the overall risk of alcohol-related cancer rose by 19%. The breakdown by cancer type is striking:

• A 27% higher risk of upper aerodigestive tract cancer
• A 46% higher risk of liver cancer
• An 18% higher risk of breast cancer
• A 16% higher risk of colorectal cancer

By age 85, people who drank more than ten drinks per week carried an estimated 4.9% higher absolute risk of developing an alcohol-related cancer than those who drank little or nothing. Breast cancer drove that excess risk in women. Colorectal cancer drove it in men.

Staying Within Guidelines Still Carries Risk

Australia’s National Health and Medical Research Council updated its guidelines in 2020. It now recommends no more than ten standard drinks per week. The study calculated that if all Australians followed this advice, around 3,733 fewer cancer cases would occur each year.

That is a significant reduction. But here is what often goes unsaid. Nearly half of all alcohol-related cancers in Australia occur in people who drink at or below that guideline limit. Staying within ten drinks per week does not fully protect a person from cancer risk.

Less is better. The guidelines define a threshold for reducing overall harm. They do not suggest that drinking up to ten drinks per week is without risk.

Awareness Remains Dangerously Low

Despite mounting evidence, most Australians do not connect drinking and cancer risk in their everyday thinking. A 2020 survey found only around half of Australians knew that drinking could cause cancer at all. Awareness was even lower for specific cancers. Just 16% of people knew about the connection between alcohol and breast cancer. Only 29% knew about mouth and throat cancers.

This gap matters. Alcohol is the third leading preventable cause of cancer, sitting alongside tobacco and overweight and obesity. Yet it rarely receives the same level of public health attention as those other risk factors.

Why Drinking and Cancer Risk Matters Most for Older Adults

Most public health campaigns focus on younger people and the short-term consequences of heavy drinking. This research highlights a different and often overlooked problem.

Cancer risk from drinking builds over time. Middle-aged and older adults carry the greatest burden of alcohol-related cancers. These are the very people that mainstream health messaging rarely reaches on this topic.

For anyone in that age group who drinks regularly, even at a seemingly modest level, the evidence now makes a clear case for reconsidering those habits.

What This Research Means

The study draws on one of Australia’s largest and longest-running health cohorts. It uses locally generated data rather than international estimates. It also accounts for cancer risk linked to former drinking, something earlier Australian studies did not do.

The researchers are not calling for alarm. They are calling for informed choices. Cutting back on alcohol, even by a small amount, can meaningfully lower cancer risk over a lifetime.

Around 80% of Australian adults drink alcohol. Nearly one in three currently exceeds the NHMRC weekly guideline. For a country with those figures, this research carries serious public health weight.

Source: dbrecoveryresources