I'm a diabetic, does wine raise or lower my blood sugar level?





Quick Answer
Wine may raise, lower, or have little immediate effect on blood sugar. Sweet wine and sugary mixers can raise glucose, while alcohol can cause delayed hypoglycemia—especially in people using insulin or sulfonylureas. The low may occur several hours later because the liver gives priority to processing alcohol instead of releasing stored glucose. Never drink on an empty stomach, and do not start drinking wine to lower blood sugar.


Answer by Dr. Albana Greca, MD, MMedSc



Hi there,



The effect of wine depends on the type and amount of wine, what you eat with it, your glucose level, physical activity, and the diabetes medicines you use.



Can Wine Raise Blood Sugar?



Dry wine usually contains only a small amount of carbohydrate, but sweet, dessert, fortified, and flavored wines may contain considerably more. Sugary mixers and a carbohydrate-heavy meal can also raise glucose after drinking.



To understand meal-related changes, see our guide to blood sugar levels after eating.



Can Wine Lower Blood Sugar?



Yes. Alcohol can reduce the liver’s ability to release glucose into the bloodstream. This may cause delayed hypoglycemia, particularly when wine is consumed without food or combined with insulin, sulfonylureas, exercise, or a missed meal.



The low may occur during the night or many hours after the last drink. Learn the warning signs in our guide to low blood glucose and its causes.



Alcohol does not lower glucose by stimulating a dependable surge of insulin, and wine should never be used as a treatment for high blood sugar.



How Much Is One Drink?



One standard serving of wine is about 5 fluid ounces, or 150 mL, at approximately 12% alcohol. A large home or restaurant glass may contain two or more standard drinks.



If your healthcare professional says alcohol is safe for you, commonly used limits are no more than one standard drink per day for women and two for men. These are maximum limits, not recommendations to drink every day.



How to Reduce the Risk




  • Do not drink on an empty stomach; have wine with a balanced meal.

  • Choose a measured serving rather than repeatedly topping up the glass.

  • Avoid sweet wines, sugary cocktails, and regular soda mixers.

  • Check glucose before drinking and later as advised, especially before sleep.

  • Carry glucose tablets or another fast-acting carbohydrate.

  • Do not skip food or take extra insulin to “cover” alcohol without instructions.

  • Make sure someone with you knows that you have diabetes.



People using insulin need additional precautions. See type 1 diabetes and alcohol drinking and our insulin treatment guide.




Important: Alcohol intoxication and hypoglycemia can both cause confusion, slurred speech, drowsiness, and poor coordination. Do not assume that unusual behavior is caused only by alcohol—check glucose when possible.


What If Blood Sugar Falls?



If glucose is 70 mg/dL or lower and you can swallow safely, take 15 grams of fast-acting carbohydrate, wait 15 minutes, and check again. Repeat if it remains low.



Do not place food or drink into the mouth of a person who is unconscious, having a seizure, or unable to swallow. Use glucagon if available and call emergency services.



Who Should Avoid Alcohol?



Avoid wine if you are pregnant, cannot recognize low glucose, have repeated severe hypoglycemia, liver or pancreatic disease, very high triglycerides, an alcohol-use disorder, or take a medicine that interacts with alcohol. Review possible interactions in our diabetes medicine safety guide.




Seek urgent help for severe confusion, fainting, seizure, repeated vomiting, inability to swallow, or a low glucose level that does not improve.


My Advice



Wine does not have one predictable effect on diabetes. A sweet wine may raise glucose first, while the alcohol may contribute to a delayed low later. If you choose to drink and your doctor agrees it is safe, keep the serving small, drink with food, and monitor carefully.



For safer daily management, follow the measures in how to control diabetes.



Hope this helps.



Dr. Albana Greca



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References






Educational only — not personal medical advice. Ask your doctor or pharmacist whether alcohol is safe with your diabetes medicines and health conditions. Never use wine to treat high or low blood sugar.



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