I have actually been doing it for past several months and it really works!!
I keep a container of green peppers, celery, carrots in the refrig. Cut, clean, ready to eat. Take a serving in car when I have errands to run. For lunch, I grab a serving of it. Late at night, when I want something, I grab the already to go veggies instead of high calorie item. Secret, don't run out! if low, I make sure I get to store and clean and cut veggies to be prepared.