Most people with diabetes have a question about alcohol at some point: a wedding, a game night, a holiday dinner, or just a glass of wine with dinner. The honest answer has two parts. Some drinks add carbohydrate, and that part is easy to count. The harder part is that alcohol can interfere with how the liver releases glucose, which can lead to low blood sugar hours later. This guide covers both, compares the drinks, and lists who should skip alcohol entirely.
Quick answer: Alcohol can lower blood sugar, sometimes hours after the last drink, and the risk is higher with insulin or certain diabetes medicines. The NIH MedlinePlus patient instructions say to drink only with a meal or a carbohydrate snack, never skip meals, and check glucose before, during, and for hours after drinking. Some people should not drink at all. If you do not drink, nothing here is a reason to start. This is general education, not medical advice. Ask your care team whether alcohol is safe for you and, if it is, what limit applies.
Why alcohol is different from food
MedlinePlus explains that while your liver is processing alcohol, it stops releasing glucose. That is the reason alcohol can push blood sugar down, and the risk remains for hours after your last drink. It is stronger when you take insulin or certain diabetes medicines. A handout from the UMass Diabetes Center of Excellence adds that alcohol does not need insulin to be processed and is not converted to glucose, that it can cause a slight rise in blood sugar followed hours later by a low, and that the risk of low blood sugar can last up to 24 hours. It also says women metabolize alcohol more slowly than men, which increases the risk of a prolonged low. You can read the source pages at MedlinePlus and the UMass Diabetes Center of Excellence handout.
One more point from MedlinePlus is easy to miss: the symptoms of low blood sugar, such as shaking, sweating, headache, hunger, unclear thinking, and blurred or double vision, are very similar to the symptoms of being drunk. Other people may assume you are intoxicated when you need treatment, which is why the UMass handout suggests wearing a medical ID and drinking with someone who knows what to do.
What counts as one drink
A drink in most guidance means a standard serving, not a standard glass. MedlinePlus lists the standard amounts, and the UMass handout says one serving is about 15 grams of alcohol.
| Drink | Standard serving | Alcohol content used |
|---|---|---|
| Beer | 12 oz (360 mL) | 5% alcohol |
| Wine | 5 oz (150 mL) | 12% alcohol |
| Distilled spirits | 1.5 oz (45 mL) shot | 80 proof (40% alcohol) |
Many restaurant pours, craft beers, and mixed drinks are larger or stronger than these amounts, so one glass can count as more than one drink. Treat the table as the reference, and check labels when they exist.
Carbohydrates in common drinks
Carbs are the part of alcohol you can count. The table shows two sources side by side: the UMass handout, and USDA SR Legacy entries scaled to a standard serving by our own arithmetic. The numbers do not match exactly, because brands, recipes, and serving weights differ, so read each pair as a range.
| Drink (standard serving) | UMass handout (g carbs) | USDA, scaled (g carbs) |
|---|---|---|
| Regular beer, 12 oz | 13.2 | 12.6 (FDC 168746) |
| Light beer, 12 oz | 4.6 | 5.8 (FDC 168749) |
| Red wine, 5 oz | 2.5 | 3.8 (FDC 173190) |
| White wine, 5 oz | 1.2 | 4.0 (all table wine, FDC 173185) |
| Liquor, 80 proof, 1.5 oz | 0 | not checked |
| Non-alcoholic beer, 12 oz | 14 | not checked |
How we scaled the USDA rows: beer is 3.55 grams of carbohydrate per 100 grams times a 356-gram can, light beer is 1.64 times 3.56, red wine is 2.61 times a 147-gram serving, and all table wine is 2.72 times a 148-gram serving. The USDA page does not state the fluid-ounce equivalent of the wine servings, so those two rows are the least certain. The non-alcoholic beer figure looks high compared with the other beers, and we could not verify it, so check the label on the one you drink.
Mixers are the other carb source. The UMass handout recommends avoiding mixed drinks, coolers, and sweet wines, and using reduced-calorie mixers such as water, club soda, seltzer, diet soft drinks, diet tonic water, or tomato juice. We did not look up exact carbohydrate numbers for specific mixers, so read the label or ask for the nutrition information.
Limits: what the guidance says
MedlinePlus says women should have no more than 1 drink per day and men no more than 2. The UMass handout gives the same limits and adds 1 drink per day for people age 65 and older. Both say to drink only if your diabetes is in good control and your care team agrees.
One change is worth knowing. The 2020 to 2025 Dietary Guidelines for Americans used the same 1 and 2 drink limits. According to an AARP report published January 23, 2026, the 2025 to 2030 guidelines dropped specific numbers and now say to consume less alcohol for better health. We did not read the guidelines document itself, and the diabetes pages above still use the older numbers. The takeaway is not that more is fine. It is that the right limit for you may be lower, or zero, and your care team should decide it with you.
Who should not drink
The UMass handout lists people who should avoid alcohol: anyone who is driving or pregnant, people with a history of alcohol abuse, people who have frequent hypoglycemic reactions, people taking certain medicines (ask a diabetes educator or pharmacist), and people with liver disease, pancreatitis, or peptic ulcer or gastritis. MedlinePlus adds that if you have complications such as nerve, eye, or kidney damage, your provider may recommend that you do not drink any alcohol. The UMass handout also notes that alcohol may raise weight, triglycerides, and blood pressure, can damage the liver, and can worsen neuropathy.
If you drink: the safety steps both sources agree on
- Drink with food. MedlinePlus says to have alcohol with a meal or a carbohydrate-rich snack, and never skip a meal or have alcohol in place of one.
- Check your glucose. MedlinePlus advises checking before you drink, while you drink, a few hours later, and for up to 24 hours, and making sure your glucose is at a safe level before you go to sleep. The UMass handout suggests a carbohydrate snack before bed and checks in the middle of the night.
- Be careful with exercise. MedlinePlus says not to exercise after drinking, and the UMass handout says not to exercise before drinking, since exercise increases insulin sensitivity and raises low blood sugar risk.
- Know the signs of a low. They look like intoxication, so carry or wear medical ID and drink with someone who knows what to do.
- Do not stack drinks. Learn your response to one drink before trying more, especially if you rarely drink.
None of this is dosing advice. If you take insulin or a sulfonylurea, ask your prescriber what to do on a night you plan to drink, and do not change a dose on your own.
Alcohol, your liver, and fatty liver
Alcohol is processed by the liver, and so are many metabolic problems. If you have fatty liver or a high triglyceride level, alcohol is something to bring up with your care team. Our complete guide to fatty liver (MASLD) explains how the liver and metabolic health connect, and diet for high triglycerides covers the food side. The UMass handout lists higher triglycerides and liver damage among the possible effects of alcohol.
What a CGM can and cannot show
A continuous glucose monitor can show the delayed drop that alcohol can cause, because it records overnight when you are not checking. It cannot tell you why a number fell, and it does not make drinking safer. Over-the-counter sensors such as Stelo and Lingo do not provide urgent low alarms and are not intended for people who use insulin, so a person on insulin should ask about a prescription CGM. Read how to read your CGM data before trusting a single reading, since lying on a sensor can cause a false low. We did not find research on how alcohol affects the accuracy of CGM sensors, so we make no claim about that.
Worked example: carbohydrate in two drinks
Suppose two drinks of the same type, using the UMass carbohydrate values and the 15 grams of alcohol per standard drink that the handout gives. This is an illustration of the counting, not a plan.
| Two drinks of | Carbs (g) | Alcohol (g) |
|---|---|---|
| Regular beer, 12 oz each | 26.4 | 30 |
| Light beer, 12 oz each | 9.2 | 30 |
| Red wine, 5 oz each | 5.0 | 30 |
| White wine, 5 oz each | 2.4 | 30 |
| 80 proof liquor, 1.5 oz each, with a no-sugar mixer | 0 | 30 |
The carbohydrate range is wide, from 0 grams to 26.4 grams for the same number of drinks, but the alcohol amount is the same in every row. That is the key point. Switching to a lower-carb drink changes the carbohydrate, and it does not remove the risk of a delayed low, which comes from the alcohol itself and from what you ate. Mixers with sugar add carbohydrate on top of the numbers above.
Common mistakes
- Drinking on an empty stomach. MedlinePlus says to drink with a meal or snack and not in place of one.
- Judging only by carbs. A zero-carb drink can still contribute to a low blood sugar hours later.
- Going to bed without a check. The delayed low is the hazard that gets people overnight.
- Counting by the glass. Bar pours are often larger than the standard serving.
- Using sweet mixers. Cooler, sweet wine, and sugary mixers add carbohydrate quickly.
- Not telling anyone. Low blood sugar looks like intoxication, so tell someone with you and wear ID.
Questions to bring to your appointment
- Is alcohol safe for me with my medicines, my liver, and my complications?
- If I drink, what limit applies to me?
- What should I check, and when, on a night I drink?
- Do I need a snack before bed after drinking?
- Would a CGM help me see overnight patterns?
Frequently asked questions
Can people with diabetes drink alcohol?
Some can, in moderation, if their diabetes is in good control and their care team agrees. MedlinePlus says to drink only with food and warns that alcohol can lower blood sugar for hours. Some people should not drink at all, including those with liver disease, frequent low blood sugar, or certain complications.
Does alcohol raise or lower blood sugar?
Mostly it lowers it. While the liver is processing alcohol it stops releasing glucose, so blood sugar can fall, sometimes hours after the last drink. A UMass handout says alcohol can also cause a slight rise first, followed by a low several hours later, and that the low risk can last up to 24 hours.
How many drinks are okay with diabetes?
MedlinePlus says no more than 1 drink a day for women and 2 for men, and the UMass handout adds 1 a day for people 65 and older. The 2025 to 2030 Dietary Guidelines reportedly dropped numeric limits and say to consume less alcohol. Ask your care team what limit, if any, applies to you.
What is the best alcohol for diabetes?
There is no safe or best choice that removes the risk. Spirits with a no-sugar mixer have the least carbohydrate, light beer and wine have a few grams, and regular beer and sweet drinks have more. Alcohol itself can still cause a delayed low, so the amount and the food you eat with it matter.
Can I drink on insulin or diabetes pills?
MedlinePlus says insulin and certain diabetes medicines can make low blood sugar from alcohol more severe. Ask your prescriber what to do on a night you plan to drink, and do not change a dose by yourself.
Why do low blood sugar and being drunk look alike?
MedlinePlus says the symptoms are very similar: shaking, sweating, headache, hunger, unclear thinking, and blurry or double vision. That is why people suggest wearing medical ID and drinking with someone who knows what to do.
Should I check my blood sugar after drinking?
Yes. MedlinePlus advises checking before you drink, while you drink, a few hours later, and for up to 24 hours, and making sure your glucose is at a safe level before you sleep. A CGM can show the overnight pattern if you wear one.
About the author: Charles Kirkland is the founder of Metabolic Clarity Labs and author of The Journey Back. He is not a physician. This is general education, not a medically reviewed treatment plan.
Sources checked October 31, 2026. Discuss personal decisions with a qualified clinician. Do not start, stop, or change prescribed treatment based on this article.
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