Everyone knows tobacco causes cancer. Far fewer people know that alcohol does too, even though the link is just as firmly established scientifically. In France, alcohol is largely normalised: we associate it with conviviality, terroir, celebration. This positive image has a direct consequence: its link with cancer remains almost unknown to the general public. It's this silence that this article aims to fill.
No scaremongering, though: the goal is neither to guilt-trip nor to frighten, but to give clear information so you can decide with full knowledge of the facts. Here's what the science says, simply.
1. A definite carcinogen… yet little known
Since 1988, the International Agency for Research on Cancer (IARC, the World Health Organization's agency specialising in the subject) has classified alcohol among Group 1 carcinogens, the highest category, that of tobacco and asbestos. So it isn't a "suspected" risk, but a demonstrated fact.
In France, alcohol is the second preventable cause of cancer after tobacco: an estimated 28,000 new cancer cases are attributable to alcohol each year, nearly 8% of all cancers, and around 16,000 deaths. Yet awareness of this risk remains very low, precisely because alcohol is culturally valued. This gap between the facts and beliefs is the heart of the problem.
2. Seven cancers concerned (including one we don't suspect)
The link is now clearly established for seven sites:
- ●the mouth, pharynx and larynx (the upper aerodigestive tract);
- ●the oesophagus;
- ●the liver (alcohol is involved in about 40% of liver cancers in France);
- ●the colon and rectum (more than 6,600 cases a year);
- ●the breast (more than 8,000 cases a year).
It's the last one that surprises the most. Breast cancer is, in number, the leading alcohol-related cancer in women in France, and almost no one knows it. More disconcerting still: this risk exists from low amounts, not only with heavy consumption.
3. No need to drink "a lot"
This is the most widespread misconception: cancer would be "an alcoholic's problem." That's inaccurate. There is no safe threshold: the probability rises from one standard drink a day, then increases with the total amount consumed.
And since people who drink moderately are far more numerous than those who drink heavily, a large share of alcohol-related cancers comes precisely from regular, moderate consumption, not just excess. Worldwide, more than half of these cancers occur in people drinking fewer than two drinks a day or intermediate amounts. In other words, it's the "small daily drink" that's concerned, and not only heavy drinking.
4. Why alcohol causes cancer
The main mechanism has a name: acetaldehyde. To eliminate alcohol, the body converts it into this toxic substance, which damages cells' DNA and hinders its repair, it is itself classified as carcinogenic. A telling fact: acetaldehyde is also what causes facial flushing in some people after a few sips. In them, the body eliminates it poorly, and the risk of oesophageal cancer is higher if they drink.
Three other mechanisms add to this. For breast cancer, alcohol raises the level of certain hormones (oestrogens), which fuel a portion of these cancers. In the mouth and throat, alcohol acts as a solvent that makes the mucous membranes more permeable to other carcinogens: that's why the alcohol + tobacco combination is so dangerous, the two don't add up, they multiply, up to a several-tenfold increase in the risk of certain mouth cancers. Finally, in the liver, chronic consumption promotes fatty liver then cirrhosis, the ground on which liver cancer develops.
5. The good news: cutting down lowers the risk
This risk is anything but inevitable. Many studies show that reducing, or stopping, consumption lowers the risk over time, particularly for cancers of the mouth and oesophagus. It's never too late, and every drink avoided truly counts.
The message echoes that of the whole series: less is better. Alcohol-free days and the drinking benchmarks (fewer than 10 drinks a week, no more than 2 a day) directly reduce this risk. And to take stock of your personal situation, an Iris Prévention health check-up helps situate your consumption, spot your own risk factors, the combination with tobacco, for example, and, if you wish, be directed towards suitable support.
To go further
Related articles on the Iris Prévention blog:
- ●The standard drink: what if you're drinking more than you think?
- ●Red wine good for the heart, a digestif that helps digestion… 7 myths decoded
- ●Two alcohol-free days a week: the little ritual that changes everything
- ●Alcool-Info-Service, information and help, anonymous and free: [https://www.alcool-info-service.fr/](https://www.alcool-info-service.fr/)
- ●French National Cancer Institute (INCa), Alcohol and cancer risk
💡 Key tips
- The least-known fact: alcohol has been classified a definite carcinogen (Group 1) since 1988, at the same level as tobacco and asbestos. It isn't a matter of "drinking too much": the risk begins from low doses.
- Seven cancers concerned. Breast, colon-rectum, mouth, pharynx, larynx, oesophagus and liver. The link with breast cancer, very little known, exists even at low doses, and it is, in number, the leading alcohol-related cancer in women in France.
- The real culprit is called acetaldehyde. In breaking down alcohol, the body makes this toxic substance that damages DNA. It's also what causes facial flushing in some people: a sign they eliminate it poorly, and an added risk if they drink.
- Alcohol + tobacco = multiplied risk, not added. For mouth and throat cancers, combining the two multiplies the risk several-fold. Cutting down on either therefore counts double.
- The good news: the risk falls when you cut down. It's never too late, and every drink avoided counts. An Iris Prévention check-up helps situate your consumption, spot your personal risk factors and, if needed, direct you to support.
Sources and references
- International Agency for Research on Cancer (IARC), Alcohol classified carcinogenic to humans, Group 1 (1988)
- Shield KD, Marant Micallef C, Hill C, Touvier M et al., New cancer cases in France in 2015 attributable to alcohol consumption (Addiction, 2018)
- Rumgay H et al., Global burden of cancer in 2020 attributable to alcohol consumption (The Lancet Oncology, 2021)
- French National Cancer Institute (INCa), Alcohol and cancer risk
- Santé publique France, Lower-risk alcohol consumption benchmarks (2017)
This article is for information and does not replace medical advice. For any question about your health or your consumption, talk to your GP; for confidential, free help, Alcool-Info-Service: 0 980 980 930.
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