JP: Kind of a good question. If you were restricting carbs to the point of ketosis, which you're not, I'd say a few days. For some it's not as long, for some it's longer. It's called the metabolic shift and it takes a little time for your body to adjust to using fat as it's primary fuel source instead of carbs.
However, your case is a little different. You probably won't shift into using fat as your primary fuel source. So I'd like to give you a number, but I can't. In the past, it usually takes me a week or so. Hang in there, and if you need a mental break, give yourself a "cheat" day once a week. That way, even if you're craving chocolate, you'll know that you'll get to have it soon. Most of the time this diet shouldn't be a struggle, but I guess it can be initially depending on how you've been eating. Eat a lot and drink a lot of water.
As for milk, mainly just because it's relatively high in carbs compared to the rest of the foods in the diet. That's really the only reason.
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