No, this is not a good idea. Starving yourself puts your body into survival mode and makes losing weight much harder. You lose weight by being good to your body with fresh fruits and veggies. Juicing is a good way to get in the nutrients you need and still limit the calorie content. There is a good film "Fat, Sick, and Nearly Dead" that follows one mans journey to health by juice fasting for a year. The website is: http://www.fatsickandnearlydead.com and has good information on how to get started.
bad idea. try talking do your doc, and DO NOT take those diet pills. they are not regulated by the FDA and most times do not list all the ingredients. there have been at least a few documented deaths from the pills.