OK, ice cream is amazing! However I hate to be the one to tell you it isn't allowed on Step 1. I need to find it in the book. I don't have time right now.
On Step 2, it is but only if it has artificial sweeteners. I will have to find it in the book and post it here.
It is a bit confusing, but there are "low impact carbs" and "high impact carbs" and even though there is the right amount of carbs, if they are the "high impact" variety, they aren't allowed at all until Step 3
At least I think you can have SOME high impact for Step 3, I have not read Step 3 again, it will confuse me.