The U.S. Dietary Guidelines recommend no more than 2 drinks per day for men and 1 drink per day for women. But newer research suggests even those limits carry measurable health risks, and some countries have recently set much lower thresholds. The answer depends on your age, sex, medications, and which risks you’re most concerned about.
What the Current Guidelines Say
The Dietary Guidelines for Americans, 2020-2025, define moderate drinking as up to 2 standard drinks per day for men and up to 1 for women. These limits have held steady across the last two editions of the guidelines. They aren’t a recommendation to drink, though. The guidelines explicitly state that people who don’t currently drink should not start.
Canada took a significantly more conservative position in 2023. Updated Canadian guidance sets the low-risk threshold at just 2 standard drinks per week. At 3 to 6 drinks per week, your risk of breast and colon cancer starts climbing. At 7 or more drinks per week, your risk of heart disease and stroke increases significantly. That’s a dramatic gap between what the U.S. and Canada consider acceptable.
What Counts as One Drink
A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol. In practical terms, that’s:
- Beer: 12 ounces at 5% alcohol
- Wine: 5 ounces at 12% alcohol
- Liquor: 1.5 ounces (one shot) at 40% alcohol (80 proof)
- Malt liquor: 8 ounces at 7% alcohol
These numbers matter more than most people realize. A typical restaurant pour of wine is 6 to 8 ounces, not 5. Many craft beers run 7 to 9% alcohol, meaning a single pint can equal nearly two standard drinks. If you’re tracking your intake against guidelines, you need to count in standard drinks, not glasses.
Why Limits Differ for Men and Women
The gap between male and female limits isn’t arbitrary. Women absorb more alcohol per drink and take longer to process it, resulting in higher blood alcohol levels even when they consume the same amount as a man of similar size. Several factors drive this: women tend to have less body water (which dilutes alcohol), a higher ratio of body fat to muscle, and different hormone levels that affect how the liver breaks alcohol down. These biological differences mean the same number of drinks poses a greater health risk for women.
Cancer Risk Starts Lower Than You Think
Alcohol is classified as a Group 1 carcinogen, the same category as tobacco and asbestos. Even light drinking raises the risk of certain cancers, particularly of the mouth, throat, esophagus, and breast. Heavy drinkers are about 5 times as likely to develop mouth and throat cancers as non-drinkers. But light drinkers aren’t in the clear: women who have just one drink per day have a measurably higher risk of breast cancer than those who drink less than one per week.
The numbers from a recent U.S. Surgeon General’s Advisory put this in concrete terms. Out of 100 women who have less than one drink per week, about 17 will develop an alcohol-related cancer over their lifetime. At one drink per day, that number rises to 19. At two drinks per day, it reaches 22. For men, the corresponding numbers are 10, 11, and 13 per 100. Those increases are modest at the individual level, but they’re real, and they begin at consumption levels most people would consider light.
The Heart Health Question
You’ve probably heard that a glass of red wine is good for your heart. There is real data behind this idea, but it’s more complicated than the headline suggests. A large body of research shows a J-shaped relationship between alcohol and cardiovascular disease: light to moderate drinkers have lower rates of heart disease than both heavy drinkers and people who never drink at all. One analysis of U.S. adults found that light and moderate drinkers had 31% and 38% lower cardiovascular mortality, respectively, compared to lifetime abstainers. The lowest mortality risk, about 19% lower than non-drinkers, was observed at roughly half a drink per day.
Alcohol appears to raise HDL (“good”) cholesterol, reduce inflammation, and improve blood vessel function. But these benefits come packaged with the cancer risks described above, and they don’t apply equally to everyone. Younger adults face very little cardiovascular risk to begin with, so the protective effect is largely irrelevant for them. Researchers who have studied this relationship consistently note that non-drinkers should not start drinking for heart health. The same benefits are available through exercise, diet, and not smoking, without the trade-offs.
Binge Drinking Is a Separate Threshold
Even if your weekly total stays within guidelines, how much you drink on a single occasion matters independently. Binge drinking is defined as reaching a blood alcohol concentration of 0.08%, which typically happens after about 5 drinks in 2 hours for men or 4 drinks in 2 hours for women. Canadian guidance found that more than 2 drinks on any single occasion increases the risk of injuries and violence, regardless of how little you drink the rest of the week.
Alcohol Hits Harder as You Age
Older adults often feel the effects of alcohol more strongly without changing how much they drink. This happens because the body’s water content decreases with age, so alcohol becomes more concentrated in the bloodstream. Bones thin with age as well, making falls after drinking more likely to result in fractures. The National Institute on Aging notes that older women are especially sensitive to these effects.
Long-term heavy drinking in older adults can worsen osteoporosis, diabetes, high blood pressure, and memory problems. It can also make these conditions harder for doctors to diagnose accurately. But the most immediate danger for many older adults is the interaction between alcohol and medication. Alcohol combined with opioids or benzodiazepines (commonly prescribed for pain or anxiety) can slow breathing to dangerous levels. Mixing alcohol with acetaminophen raises the risk of liver damage. Even over-the-counter antihistamines become significantly more sedating with alcohol. If you take any regular medication, whether prescription, over the counter, or herbal, check the label for alcohol warnings before drinking at all.
Practical Limits That Match the Evidence
The honest answer is that no amount of alcohol is completely risk-free. The safest amount, from a pure health standpoint, is zero. That said, the risk at low levels of consumption is small for most people, and guidelines exist to help you stay within that low-risk zone.
If you choose to drink, the U.S. guideline of no more than 2 per day for men and 1 per day for women remains the most widely referenced standard. The Canadian threshold of 2 per week represents the level at which measurable health consequences, particularly cancer, begin to appear in the data. Where you land between those two benchmarks depends on your personal risk factors: your age, your family history of cancer or heart disease, whether you take medications that interact with alcohol, and how much risk you’re comfortable accepting. Spreading your drinks across the week rather than concentrating them in one or two sessions reduces acute harms like accidents and injuries regardless of your weekly total.