Foods to Avoid in Type 2 Diabetes Alcohol Wow! Before going for a pre-dinner cocktail, or a glass of wine with dinner, make sure with your healthcare professional that it’s safe to drink alcohol, since alcohol can interfere with blood sugar levels. If you drink, in moderation, “Moderation” means no more than one serving per day for woman and no more than two for man. A typical serving is measured as 5 ounces of wine, 12 ounces of beer, or 1 ½ ounces of other liquo