This is terrifying to rabbits and should NEVER EVER be done! It's called SHOCK not a trance. And can cause severe problems for your bunny afterwards such as GI Stasis which can be life threatening. Please don't trance your bun it's cruel!
Example: a rabbit could have 1 egg cup of pellets and a pile of hay per day, plus a selection of vegetables. One day it might be a cauliflower leaf and fresh basil/parsley and another day blackberry leaves, fresh grass and a small carrot.
If you want to lose weight and simultaneously don't want to eat less Low calorie foods are the best choice for you. Find some fast working low calorie foods name. Learn the best way to lose weight fast.