I used to juice years ago. At that time my mother in-law was into juicing and she encouraged me to juice for my health. I juiced for a little while and then in my pantry it went. I took it out recently and started juicing again but not everyday as it can be pricey as I do recommend using organic produce to juice (The best is to juice everyday and drink it in the morning). Frankly fresh juice is delicious, I had tried the common carrot + apple, carrot + apple + celery, carrot + celery, carrot + pear + celery, pineapple + mango, carrot + cucumber and this. As you can see, usually I have carrot as a base. I am not quite adventurous in my juicing (as thus far no green leafy green or sprout as I eat that in my stir-fry) but I will sure to add some veggie (mostly just carrot, cucumber and celery) into the mix. Fruit juice alone would be too sweet so my juice would be vegetable base. Had a glass of this for late afternoon snack and surprisingly it's quite filling. It made 1.5 glass, my Edda had the other half. :)
I saw a documentary where a man juice for 60 days to detox and lose weight. In these 60 days, all he ate/drank were juice from fresh vegetable and fruit. He also exercised during these 60 days. At the end of 60 days, not only he lost weight, looked healthy but he was indeed healthier that he no longer needed a long list of medications. All his numbers were at normal range. This documentary is called "Fat, Sick and Nearly Dead", pretty interesting! This lead to an interesting point, my thought of this is if people are open minded, willing to change their life styles and the way they eat, all the prescriptions for high blood pressure, high cholesterol, diabetic would go down leading to less obesity, heart problem and other diseases.
Added Later:
I heard that carrot is not suitable to mix with fruit when juicing because it will prevent the absorption of vitamin C. So, it's best to separate the veggie and fruit when juicing. Carrot and apple are the only interchangeable items that can be mixed into fruit or veggie juice. So that our bodies can best absorb the nutrients. Luckily the above is the most extreme that I had used. I would suggest my readers to read more about juicing before you start.