by Jim Holloway
(Kailua Kona, Hawaii, USA)
QUESTION: What sugar does alcohol put into the bloodstream after drinking? Does alcohol raise or lower blood glucose in a person with diabetes?
Alcohol itself is not sugar and is not simply converted into blood glucose. Carbohydrates in beer, cider, sweet wine, liqueurs, cocktails, and mixers can raise glucose soon after drinking. At the same time, the liver prioritizes processing alcohol and may release less glucose, creating delayed hypoglycemia—especially with insulin, sulfonylureas, little food, exercise, or drinking at night. The result may therefore be a rise, a fall, or both at different times.
Answer by Dr. Albana Greca, MD, MMedSc
Ethanol is metabolized mainly in the liver into acetaldehyde and then acetate. It does not enter the bloodstream as glucose in the same way that sugar or starch does.
While the liver is processing alcohol, its ability to make new glucose through gluconeogenesis is reduced. This matters between meals and overnight, when the liver normally helps keep glucose stable. A delayed low may develop several hours after drinking, even if the first reading was normal or high.
The beverage may contain carbohydrate. Beer, cider, sweet or fortified wine, liqueurs, alcopops, and cocktails made with juice, regular soda, syrup, sweetened cream, or energy drinks may raise glucose soon after consumption.
Dry wine and plain distilled spirits generally contain less carbohydrate than sweet drinks, but they still contain alcohol and can still increase delayed hypoglycemia risk. Portion size and the food eaten with the drink also affect the result.
Review how drinks fit into the full meal in our guide to foods and beverages that affect blood sugar.
Alcohol suppresses the liver's glucose production. The risk is greater when a person drinks without food, has exercised, follows a very-low-carbohydrate diet, has liver disease, or uses insulin or a medicine that stimulates insulin release, such as glipizide, gliclazide, glimepiride, or glyburide.
Delayed hypoglycemia may occur overnight or the following morning. Alcohol can also make low-glucose symptoms harder to recognize because confusion, sleepiness, slurred speech, and poor coordination may be mistaken for intoxication.
People with type 1 diabetes must continue insulin. Do not omit basal insulin because you plan to drink or because you are eating less. Alcohol can increase the risk of a delayed low, while missed insulin can cause severe hyperglycemia and diabetic ketoacidosis.
Insulin adjustments around alcohol must be individualized by the diabetes team. Do not take repeated correction doses for an early high without considering that glucose may fall later.
No. Alcohol should not be used to lower glucose, HbA1c, or cardiovascular risk. Short-term glucose changes are unpredictable, and regular or excessive intake may add calories, raise triglycerides and blood pressure, worsen sleep, damage the liver or pancreas, and interfere with medicine-taking.
People who do not drink should not begin for a possible health benefit. Read our answer on red wine and blood sugar.
First ask whether alcohol is safe with your medicines and health conditions. When a clinician says moderate drinking is acceptable:
A standard drink is approximately 12 ounces of 5% beer, 5 ounces of 12% wine, or 1.5 ounces of 40% distilled spirits. Larger or stronger servings count as more than one drink. Current guidance advises no more than one drink daily for women or two for men, but less or none is safer.
Avoid alcohol during pregnancy, with recurrent severe hypoglycemia, hypoglycemia unawareness, pancreatitis, significant liver disease, very high triglycerides, an alcohol-use disorder, or when a medicine has an important interaction. Excessive alcohol and fasting also increase ketoacidosis risk in people using an SGLT2 inhibitor.
Use a blood sugar log to record the drink, food, medicine, activity, and glucose pattern rather than judging the effect from one reading.
Treat glucose below 70 mg/dL promptly with fast-acting carbohydrate if the person is awake and able to swallow. Call emergency services for unconsciousness, seizure, inability to swallow, severe confusion, or a low that does not improve. Seek emergency care for vomiting, abdominal pain, rapid breathing, confusion, or moderate or high ketones, even when glucose is not extremely high.
Alcohol does not add one predictable amount of “sugar” to the bloodstream. Carbohydrates in the drink may raise glucose first, while alcohol metabolism can cause a later fall. Review your medicine-specific risk, drink only with food if approved, monitor longer than usual, and never use alcohol as diabetes treatment.
Educational safety note: This answer is for general diabetes education only. It does not replace personal medical advice or treatment. Do not change insulin, tablets, food, or alcohol intake without discussing the plan with your healthcare provider.
Last reviewed: July 2026.
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