The honest answer is that no amount of alcohol is completely risk-free. But if you’re looking for a practical number, U.S. guidelines define moderate drinking as up to 7 drinks per week for women and up to 14 for men, with no more than one or two on any given day. Those limits are currently under review, and a growing body of evidence suggests even those numbers may be too generous.
What the Guidelines Actually Say
The CDC defines moderate alcohol use as one drink or fewer per day for women and two drinks or fewer per day for men. That translates to a maximum of roughly 7 drinks per week for women and 14 for men. These aren’t targets to aim for. They’re upper boundaries meant to separate lower-risk drinking from higher-risk drinking.
Canada updated its guidance in 2023 to a much more conservative stance: no more than two drinks per week to minimize health risks. That same year, the World Health Organization issued a statement saying “the risk to the drinker’s health starts from the first drop of any alcoholic beverage” and that there is no scientifically established safe threshold. The gap between U.S. guidelines and these international positions is significant, and it reflects how quickly the science has shifted.
What Counts as One Drink
A standard drink in the U.S. contains about the same amount of pure alcohol regardless of the beverage type: 12 ounces of regular beer (5% alcohol), 5 ounces of wine (12% alcohol), or 1.5 ounces of distilled spirits like vodka or whiskey (40% alcohol). Most people underestimate how much they’re actually drinking. A generous home pour of wine is often 7 or 8 ounces, which is closer to one and a half drinks. A pint of craft beer at 7% or 8% alcohol can count as nearly two standard drinks. If you’re trying to track your intake honestly, measuring matters more than counting glasses.
The Cancer Risk Starts Low
In early 2025, the U.S. Surgeon General issued an advisory confirming a causal link between alcohol and at least seven types of cancer: breast, colon, esophagus, liver, mouth, throat, and voice box. The word “causal” is important here. This isn’t a loose association. Alcohol directly contributes to these cancers.
What surprises most people is how little it takes. A pooled analysis of more than one million women found that drinking up to about one drink per day increased relative breast cancer risk by 10% compared to non-drinkers. For mouth cancer, a separate analysis of men and women found a 40% relative increase in odds at roughly one drink per day. These aren’t heavy-drinking numbers. They fall well within the range most people consider moderate.
The Surgeon General’s advisory notes that for breast, mouth, and throat cancers, the increased risk may begin at one or fewer drinks per day. Scientists have not identified a threshold below which alcohol’s cancer-causing effects simply switch off.
Heart Benefits Are Probably Overstated
You may have heard that a glass of red wine is good for your heart. That idea comes from older studies showing a “J-shaped curve,” where light and moderate drinkers had lower rates of heart disease and death than both heavy drinkers and non-drinkers. Some of those findings were real. Pooled data did show that light drinkers had roughly 23% lower cardiovascular mortality compared to lifetime abstainers, with moderate drinkers at about 22% lower.
The problem is methodology. Many of those studies lumped former drinkers (people who may have quit because of illness) into the “non-drinker” group, making abstainers look sicker than they actually were. When researchers corrected for this and used more rigorous designs, the apparent heart protection largely disappeared. An updated meta-analysis of 107 studies covering nearly half a million participants concluded that low-volume drinking was not associated with protection against death from any cause. A genetic study reached the same conclusion about alcohol and stroke, finding the seemingly protective effect was “largely non-causal.”
The WHO’s position is blunt: no studies demonstrate that any cardiovascular benefit of light drinking outweighs the cancer risk at the same level of consumption.
Liver Damage Has a Threshold, but It’s Lower Than You Think
Your liver processes virtually all the alcohol you consume, and it can only handle so much. Research suggests a risk threshold for alcohol-related liver disease starts around roughly two standard drinks per day for men and about one and a half for women. But the risk isn’t binary. A cross-sectional study found that for every additional 10 grams of alcohol per day (less than one standard drink), the risk of fatty liver disease increased by 9%.
For more severe liver damage, a large UK cohort study of about 400,000 women found that those consuming more than roughly 15 to 16 drinks per week had over three times the cirrhosis risk compared to women who drank only two or three per week. On the other end, intake of roughly one to two drinks per day was already associated with more than double the risk of liver disease compared to not drinking at all. The dose-response relationship is steady: more alcohol, more liver risk, with no clear “safe zone” below which nothing happens.
How Drinking Pattern Matters
Spreading seven drinks across the week is not the same as having them all on Saturday night. Binge drinking, defined as five or more drinks for men or four or more for women within about two hours, brings blood alcohol concentration to 0.08% or higher. That level of acute exposure stresses the liver, raises blood pressure, and increases the risk of injuries, heart rhythm problems, and stroke in ways that steady low-level intake does not. If your weekly total falls within moderate range but you tend to concentrate it on weekends, the health risks are substantially higher than the weekly number alone would suggest.
Age Changes the Equation
Alcohol hits harder as you get older. Your body composition shifts with age: less water to dilute alcohol, more body fat to retain it, and a slower metabolism to clear it. Older adults are also more likely to take medications that interact poorly with alcohol. These biological changes mean the same number of drinks produces higher blood alcohol levels and longer exposure in someone who is 60 compared to someone who is 30. Even if you’ve been a moderate drinker for decades, the same habit becomes riskier over time without you changing a thing.
The Calorie Cost Adds Up
Alcohol carries calories that are easy to overlook. A regular 12-ounce beer has about 153 calories. A 5-ounce glass of red wine runs around 125 calories, and a shot of 80-proof liquor sits at about 97 calories before you add any mixer. Seven drinks a week at the wine level adds roughly 875 calories, the equivalent of an extra meal or two. Over months, that can translate into meaningful weight gain, particularly around the midsection, which is associated with higher risks of metabolic disease and cardiovascular problems. Craft beers are the worst offenders, ranging from 170 to 350 calories per 12-ounce serving.
What “Healthy” Really Means Here
The Global Burden of Disease study, one of the largest analyses ever conducted on alcohol and health, concluded that the level of consumption that minimized harm across all health outcomes was zero drinks per week. That finding reflects total health impact, factoring in cancer, liver disease, injuries, cardiovascular effects, and dozens of other conditions across 195 countries.
That doesn’t mean anyone who has a glass of wine at dinner is making a reckless choice. Risk exists on a continuum. At one to two drinks per week, the added health risk is small in absolute terms for most people. At seven per week, the risks become more measurable, particularly for certain cancers. Beyond 14 per week, the risks climb steeply across nearly every organ system. The less you drink, the lower your risk. If you currently don’t drink, the evidence offers no health reason to start.