While a juice cleanse is a challenge, it isn't meant to be physically uncomfortable or painful. If you are starving and feel you simply can't go a moment longer without food, please do eat! (Just eat healthy!) Think natural, raw, clean foods. You can have a small amount of nuts, raw fruit, raw vegetables or a broth-based (vegetable, low sodium) soup of your choice. As long as you don't eat a cheeseburger, you don't have to consider your cleanse compromised or any less effective.