There are a few details you may need to keep in mind about the effects of drinking. Alcohol can make blood glucose too high or too low for those with diabetes.

If your diabetes is under control, you may have a moderate amount of alcohol – one drink daily, says the American Diabetes Association (ADA). One drink is a 12-ounce beer, 5 ounces of wine, or 1-1/2 ounces of liquor. If you have type 1 diabetes and you're not overweight, this serving would be an addition to your meal plan. If you have type 1 or 2 diabetes and are overweight, any alcohol you drink should be substituted for another food in your meal plan. Ask your registered dietitian for help.

Here are a few more tips from the ADA:

Always enjoy your cocktail with a meal. When you do drink alcohol, be sure to eat a meal to prevent low blood glucose.
Choose low-calorie mixers. Alcoholic beverages with mixers, wine and beer have carbohydrates and can cause your blood glucose to get too high. Choose lower calorie mixers such as mineral water, club soda, diet tonic water, diet soda, coffee or tomato juice. You can also choose light beer or a glass of wine to keep carbohydrates low.
Know when to avoid. Always stay away from alcohol if your blood glucose is out of control, you have an empty stomach, neuropathy, problems with alcohol abuse, are pregnant, take prescription or over-the-counter medications that react with alcohol, or have just worked out vigorously.