I'm pretty lean right now, so based on Par Deus's advice, I carb load for 12 hours. I start with instant, flavored cream of wheat or oatmeal for my first three meals, then eat regular cream of wheat or oatmeal sweetened with 1 T honey for my last three meals. By the time I finish the last meal, I'm sick of carbs and am ready to go back to eating protein.
It definitely keeps the fat burning though - I'm amazed at how well adding refeeds keeps me from plateau'ing. I just keep them under control, count the calories, etc.