Plans that sugegst a refeed from what I've seen, say high carbs, but low fat. It is the combination of carbs and fat that lead to weight gain. Pizza, nachos, and beer are high in carb and high in fat. They are some of the worst foods you could of done. Candies and such have no nutricional value and rush strait to the blood and in turn cause a sever insulin rush. Any fat eaten will be stored. The scale may go down, but it is most often water. Remember too that fat is much less dense then muscle so you can happily put on fat and have tight clothing before the scale budges.

For some refeeds can work, and planned treats can help them to stay on plan. For the ones it works long term they learn all they can about the science behind them and do them smartly.