If you need to use a cleanse to get you out of bad habits and on track to a healthier lifestyle, it can surely have a place. If you feel the need for a mental break from making your daily food choices, take the break. But don't lean on cleansing as a crutch for an otherwise unhealthy lifestyle. There is no "Get Healthy Quick" scheme. Much like you can't get abs in seven days, you also can't eliminate health problems in a week. Any time you read about improving your health in a short period of time or through easy methods, you should immediately be skeptical.