I know, it's scary at first, but if you have a plan to end the carbup, you'll be fine. I generally really crank the fats the next day and do a lot of exercise to get back into nice, comfortable ketosis. I find I don't need to do this as much now, but in the beginning, if I didn't get into ketosis right away, I'd be stuck with those old, nasty cravings.

Remember, for the day after, avocados are your friends.