I have a juicer to juice my fruits and veggies. This way I am getting fresh enzymes and vitamins from them. They are not bad because it is fresh, natural sugar. However, if it is pasteurized juice then its not good because the enzymes are dead and all it is is plain sugar. A juicer is necessary to make good, healthy juice. I do not fast on juice beacause my extreme hypoglycemia inhibits that for now, but I do eat smaller meals throughout the day along with many cups of freshly juiced juice!! Its kinda like a modified Gerson therapy, like that used to treat many people with cancer- its good stuff. There are endless benefits of drinking fresh juice.