I don't think you have to snack if you don't want to. You're just supposed to "eat to capacity of the most fattening foods", according to Pounds and Inches. I would think you could easily accomplish that by eating meals instead of snacks. The hcg makes it difficult to eat during loading so snacking is usually beyond my ability anyway. Eating meals is challenging enough. It is likely that you will come out of ketosis when you start eating the required fruit, vegetables and starch during P2.
As for guidance on this protocol, there's no better guidance than reading the original manuscript and then reading it again. The phases aren't numbered there...those are from Kevin Trudeau's book...but you can easily see the different phases detailed if not numbered: loading, the VLCD phase, 3 weeks of no sugar/no starch, and slowly adding all foods back in.
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