My take on the '72 Atkins--
Essentially, the purpose is to get you into KETOSIS, and to keep you there for consistent weightloss. No products, no "fuzzy math" foods (net carbs), just complete, whole, non-processed foods. 3-4 oz of hard cheese (MAX), 3 tbsp. heavy cream (MAX). 2C salad mix, and all the protein and fat you desire.