I've been juicing a month now, and it kick started me out of a stall! (Of course I work out more, eat well and track too)
I think it's partly cos u feel like being healthier and actually less hungry when ur body is nourished with Vitamins and minerals.
That's why 30 mins after a McDonalds meal people get hungry again, cos there is nothing to really nourish your body.
My skin + energy levels have improved greatly.
The trick for WLS people is keep the fruit out of the juicer. Greens greens greens! It's not tasty to drink with all that kale, celery and spinach in the juicer but taste isn't the point.
I have a green juice first thing before my Breakfast (usually an egg or egg on toast).
If u don't use fruits, the calories and sugar are very low. Some days when I'm not in the mood for the bitter green taste, I add a small green apple or some carrots.
I recommend trying it!