I'm no dietician, but I'd imagine it would be fine to do this. Of course, it takes about four cups of lettuce to give you the same amount of fibre as an apple.

I'm no dietician, but I'd imagine it would be fine to do this. Of course, it takes about four cups of lettuce to give you the same amount of fibre as an apple. Multiply that by the number of apples it took to make your juice and that's a lot of lettuce even if you happen to really love lettuce.