Vegetable juicing is critical to good health because it is an important source of raw food. Each of us needs raw foods every day, and juicing is an excellent way to make certain you receive large quantities of such raw foods. Masticating juicers are credited with extracting juices at slower speeds that enable the juicer to produce juice more efficiently and with a higher nutrient content. The lower speed also minimizes oxidation which is known to damage or destroy enzymes contained in the juice. Also known as single gear or wheatgrass juicers, masticating machiness are designed specially to juice leafy greens and wheatgrass and some mastication juicers double as food processers.