Alcohol and health: risks, standard drinks, cutting back

In short

• The NHS says there is no safe drinking level, and the CDC says drinking less, or not at all, lowers health risks.
• Earlier evidence that moderate drinking protects the heart is now considered weaker, so nobody should start drinking for their health.
• Alcohol can disrupt sleep, raise blood pressure, harm the liver and raise the risk of several cancers.
• A US standard drink contains 14 grams of pure alcohol, and many drinks contain more than one.
• If you drink heavily every day, get medical help before stopping, because withdrawal can be life-threatening.

What happened to the wine-is-good-for-you idea

The NHS notes that earlier evidence that moderate drinking protects the heart is now considered weaker. The NIAAA adds that alcohol misuse can raise blood pressure and cause an irregular or faster heartbeat, that it increases the risk of ischemic heart disease and heart attack, and that even low drinking levels may carry some risk.

The practical takeaway is simple. If you do not drink, there is no health reason to start. If you do, the CDC says drinking less lowers health risks.

What counts as a standard drink

According to the NIAAA, a US standard drink contains 0.6 fluid ounces, or 14 grams, of pure alcohol. The alcohol percentage varies by beverage, so the size of the glass alone does not tell you how many standard drinks you are having. Examples of one standard drink:

• 12 fluid ounces of regular beer at about 5% alcohol by volume;
• 8 to 10 fluid ounces of malt liquor or hard seltzer at about 7%;
• 5 fluid ounces of table wine at about 12%;
• 1.5 fluid ounces of distilled spirits at about 40%.

A 12-ounce craft beer at 10% contains two standard drinks. Home pours are often bigger than these, so check the label and measure for a week to see your real intake.

Moderate and excessive drinking

The CDC describes moderate drinking as two drinks or less in a day for men and one drink or less in a day for women. It defines binge drinking as four or more drinks for women or five or more for men on one occasion, and heavy drinking as eight or more drinks for women or 15 or more for men in a week. Any drinking under age 21 or during pregnancy counts as excessive. These are limits for risk, not targets, and drinking less is lower risk still.

How alcohol affects the body

1. Sleep.The NHS says alcohol may help some people fall asleep quickly, but it can disrupt sleep patterns and prevent deep sleep. Cutting down should leave you feeling more rested.
2. Blood pressure and heart.Alcohol misuse can raise blood pressure and cause an irregular or faster heartbeat. Long-term heavy drinking can weaken the heart muscle.
3. Liver.Heavy drinking can cause alcohol-associated fatty liver, hepatitis, fibrosis, cirrhosis and liver cancer.
4. Cancer.The NIAAA lists cancers of the head and neck, esophagus, liver, breast and colon and rectum, with risk rising alongside consumption. It says even one drink a day may raise breast cancer risk by 5% to 15%.
5. Pancreas and immune system.Long-term misuse can lead to pancreatitis, and drinking can weaken the body's defenses against disease.
6. Mental health and the brain.The NHS says regular high-risk drinking can worsen mental health and that long-term drinking can cause brain damage leading to memory loss and behavior changes.

When not to drink

• During pregnancy or when you might become pregnant. The NHS says the safest choice is to avoid alcohol completely.
• Under age 21 in the United States, according to the CDC.
• If you have liver disease or a history of pancreatitis, unless your clinician says otherwise.
• If you take a medicine that interacts with alcohol. Ask a pharmacist, which takes a minute and can prevent real problems.
• Before driving, working with machinery or any activity that needs a clear head.

A practical plan to cut back

1. Count what you drink.Record it as you go for a week and compare it with the standard drink sizes above.
2. Have drink-free days.The NHS suggests several drink-free days each week.
3. Go smaller and weaker.Choose smaller glasses, such as bottled beer instead of pints, or drinks with a lower alcohol percentage.
4. Pace yourself.Eat something and drink water before you start, and alternate alcoholic drinks with non-alcoholic ones.
5. Set a limit first.Decide how much you will drink before you go out, and take only that budget.
6. Tell people.Let friends and family know so they can support you.

If it is more than a habit

The CDC notes that many people who drink excessively can cut back without specialized treatment. If you cannot cut back, drink despite problems with your health or relationships, or feel you need more for the same effect, talk to your primary care provider.

Withdrawal can be dangerous. MedlinePlus says symptoms such as tremor, anxiety, sweating, rapid heart rate and insomnia usually begin within 8 hours of the last drink and peak at 24 to 72 hours. Delirium tremens can cause severe confusion, hallucinations, seizures and fever. Moderate-to-severe cases usually need a hospital or specialized facility, so plan with a clinician before stopping if you drink heavily.

Red flags: when to call 911

Call 911 for seizures, fever, severe confusion, hallucinations or an irregular heartbeat during withdrawal. Also call if someone cannot be woken, breathes slowly or irregularly, or vomits while unresponsive after drinking. Stay with the person and place them on their side.

Seek urgent care for vomiting blood, black stools or yellowing of the skin or eyes. See your primary care provider if you are worried about how much you drink or how it affects your sleep, mood or blood pressure.

Questions and answers

Sources

1. CDC — About Alcohol Use
2. NIAAA — What Is A Standard Drink?
3. NIAAA — Alcohol's Effects on the Body
4. NHS — The risks of drinking too much
5. NHS — Tips on cutting down alcohol
6. MedlinePlus — Alcohol withdrawal

Sources checked on 29 October 2026.