Champagne, chocolate, puff pastries, and cheese platters . . . what other reasons do you need to take on a juice cleanse this January!? We all feel it. A cleanse is in order, but it is important to know that all of those extra holiday indulgences may increase the detoxifying effects during your New Year's cleanse. While drawing out impurities to remove toxins is one of the goals of a great juice cleanse, mobilizing these toxins in your blood can cause headaches, fatigue, nausea, or bloating.