Does alcohol increase your risk of cancer, even at one drink per day?
Yes, even one drink per day measurably increases cancer risk, particularly for breast cancer. No amount of alcohol has been found at which the risk disappears entirely.
Alcohol increases the risk of several types of cancer, and no safe threshold has been found. Worldwide, more than 741,000 new cancer cases were attributed to alcohol use in 2020, including cancers of the oesophagus, liver, colon and breast. In the United States, alcohol is even the third largest avoidable risk factor for cancer, after smoking and excess weight.
Even one drink per day is not without risk. Of all alcohol-attributable cancers worldwide in 2020, nearly 14% occurred in people who drank fewer than 1.5 drinks per day. Even at fewer than one drink per day, there were still more than 41,000 cases recorded. This makes clear that the risk begins at modest amounts, not only with heavy drinking.
Breast cancer is the clearest example at low levels of consumption. The association has been consistently demonstrated in large epidemiological studies and there is a dose-response relationship: the more you drink, the higher your risk, but there is no amount at which the risk disappears entirely. For cancers of the mouth and throat there are also indications at low consumption, although that evidence is less strong.
Why alcohol causes cancer is well explained biologically. Alcohol is converted in the body into a toxic by-product that directly damages DNA and disrupts the repair of that damage. In addition, alcohol raises oestrogen levels in the blood, which partly explains the increased breast cancer risk. It also causes inflammation and oxidative stress, processes that promote the development of cancer cells.
This answer draws on several large international analyses and review studies, including calculations of worldwide and US cancer cases attributed to alcohol. The causal relationship at higher levels of consumption is strong and broadly supported. At low consumption (fewer than one drink per day), the evidence for breast cancer is also strong and consistent, but somewhat thinner for other cancer types.
From how much alcohol do I actually face a higher risk of cancer?
Even with light drinking your risk of mouth, throat, oesophageal and breast cancer is already measurably higher. A safe lower limit does not exist.
Does drinking less alcohol meaningfully reduce your cancer risk?
Drinking less alcohol meaningfully reduces your risk of several cancer types, although it takes years before the full effect becomes visible. Stopping sooner yields greater health gains.
Does being overweight increase my risk of cancer, and if so, which types?
Excess weight increases your risk of at least 13 types of cancer, including uterine, colorectal, breast and liver cancer. Losing weight reduces that risk, although it remains unclear whether all methods of weight loss are equally effective for immune defence against cancer.
Does working at night increase my risk of cancer?
Night work probably increases the risk of breast cancer, and possibly of other types of cancer. If you have been working night shifts for years, it is worthwhile to discuss this with your doctor and to stay alert to population screening programmes.
Does sitting a lot increase my risk of cancer, even if I exercise?
Sitting a lot increases your risk of certain cancers, even if you exercise. In addition to moving regularly, try to reduce your sitting time itself, because the two only partially compensate for each other.
Does eating from plastic packaging increase your risk of cancer?
There are indications that certain substances from plastic packaging, such as BPA and PCBs, are associated with a higher cancer risk, but cause and effect have not yet been proven. If you want to be cautious, choose glass, stainless steel or cardboard more often, and do not heat your food in plastic.