For me it was just that I did Dr. Schulze 's Bowel/Liver/Kidney Detox programs and got to know about juicing although the programs did not require a real juicer (but a manual citrus juicer and a blender.) The idea of "juicing" sounded very good to my gut and I got myself a Champion juicer and started juicing after the programs. I also became a complete vegetarian. Since then I have been drinking organic carrot/apple/garlic juice every morning and evening, sometimes with beets or parsley added. This made my facial skin smoother.
Sorry to have a long Hollywood movie intro but long story short, I'm not juicing to heal particular illness right now but for fun and it's a part of my new lifestyle. I'm loving it.
I also loved the juice fasting part of Schulze's program. Now I have a real juicer so I feel I would enjoy it more.