Updated December 16, 2014.
The following foods are allowed on Dr. Bernstein's Diabetes Diet:
Most meats and protein foods, unless carbs are added - see Low Carb Meats

Vegetables not listed above - count 1 cup raw, 2/3 cup cooked, or 1/4 cup pureed or mashed as 6 grams of carb - see Low Carb Vegetables

Dairy Products:

• Cheeses - count one gram of carb per ounce for most
• Yogurt - full fat, unsweetened - 11 grams of carb
• Cream - half a gram of carb per Tablespoon

• Unsweetened soymilk can be used as a milk substitute
• Butter or Margarine

Grain substitutes:

• Soy flour has 7.5 grams of carbohydrate per 1/4 cup
• Certain bran crackers (read labels)

Artificial Sweeteners are allowed unless they have added sugar (usually in the form of dextrose or maltodextrin), as most powdered sweeteners do. Exceptions are liquid sources of artificial sweeteners or those which come in small tablets.

Nuts - allowed, but count carbs, and Know Thyself, as many people can't get themselves to stop

Condiments and flavorings - those without sugar include spices, herbs, mustard, sugar-free/low carb salad dressings, and sugar-free flavorings and extracts (

Low Carb Condiments
)
Beverages - include water, sparkling water, club soda, diet soda, coffee, and tea. Also, low carb alcoholic beverages in moderate amounts.

Treats

• Ready made Sugar-free Jell-O Brand Gelatin or other truly sugar-free brands of gelatin - check especially for maltodextrin. The powdered kinds are more apt to have maltodextrin.

• Sugar-free puddings can be made with low carb dairy alternatives and can count as six grams of carbs as part of your meal plan
• Homemade Low Carb Desserts - such as are in Bernstein's book (Laura's Low Carb Dessert Recipes)