Your Drinking Details
2
drinks

1 standard drink = 1 beer (330ml 5%) = 1 glass wine (150ml) = 1 shot spirits (30ml)

No insulin
Yes, using insulin

Typical pre-drinking target: 126-180 mg/dL (7-10 mmol/L)

Glucose Impact Assessment
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Delayed hypo risk level
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Initial BG effect (0-2h)
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Delayed hypo risk (6-12h)
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Hypo risk window
Low Risk 1 drink with a full meal - monitor normally
Moderate Risk 2-3 drinks or drinking without food
High Risk 3+ drinks, or insulin + no food
Estimated 12-Hour Glucose Pattern
How This Works

Alcohol has a two-phase effect on blood glucose that makes it particularly complex for people with diabetes:

Phase 1 (0-2h): Carbs in beer/cocktails -> glucose RISES Phase 2 (4-12h): Alcohol blocks liver -> glucose FALLS (hypo risk)

Phase 1 (initial rise): Beer, cider, and cocktails contain significant carbohydrates that raise blood glucose within 30-60 minutes. Pure spirits have almost no carbohydrates and produce little initial rise.

Phase 2 (delayed hypoglycaemia): Alcohol is metabolised by the liver, which prioritises alcohol clearance over glucose production. This blocks gluconeogenesis - the liver's ability to produce emergency glucose - for up to 12 hours. The risk is highest 6-10 hours after drinking.

Insulin users face the greatest risk: insulin lowers glucose while alcohol simultaneously blocks the liver's emergency glucose release, creating a double hazard - especially overnight.

Safe Drinking Guidelines for Diabetes
  • Never drink on an empty stomach. Food slows alcohol absorption and provides carbohydrates to buffer the delayed hypo effect.
  • Set a bedtime glucose target of 126-180 mg/dL (7-10 mmol/L) - slightly higher than usual - before sleeping after drinking.
  • Check your glucose before bed, set an alarm to check at 3am if you've had more than 2 drinks, and check again in the morning.
  • Wear or carry medical ID that identifies you as having diabetes - hypoglycaemia can be mistaken for intoxication.
  • Tell a trusted friend or companion about your diabetes and the signs of hypoglycaemia.
  • If using insulin, consider a CGM with low-glucose alerts set overnight after drinking.
  • Keep fast-acting carbohydrate (glucose tablets, juice) at your bedside after a night of drinking.
  • Alcohol can mask the symptoms of hypoglycaemia (shakiness, sweating) - rely on your glucose meter, not how you feel.
! Medical Disclaimer
This calculator is for educational and informational purposes only. Alcohol affects individuals differently based on body weight, liver function, medications, and diabetes type. The estimates shown are general approximations. If you use insulin or are on medications that interact with alcohol, please discuss safe alcohol consumption with your diabetes care team before drinking. This tool does not encourage alcohol consumption.