Free Meals:
A single meal that breaks your diet. Main benefits are psychological. Keeps the sanity when dieting like this so long. It also makes the diet work better, in terms of hormone levels. I recommend a one hour dinner, personally. Eating your free meal for breakfast or lunch can make it very hard to go back on Kimkins for the rest of the day. Keeping it within one hour (like suggested in Carb Addicts book) keeps your insulin from shooting high, and prevents your free meal from a all day grazing fest. As far as what to eat, the healthier the food the better of course...but essentially eat what you want to. Period.When you do a free meal is up to you. Lyle MacDonald suggests 2 a week if you have a BF% of 25%or more. I do mine after every 3 whole days of Kimkins. You can do yours every 5 or every other day, whatever gets the best results for you.
Refeed:
Refeeds are exactly that, refeeding the body. You can do a refeed for 5 hours, a day, a week, or a month. They are the next level up from a free meal. You normally do a "structured refeed" after you come off of a diet to restore muscle glycogen. When we diet we cause "tissue breakdown", the refeed also helps with this. The refeed is basically a long diet break.