Fruit and vegetable smoothies are low calorie and very nutritious. Of course, you would also have to include a low-fat protein source, for complete nutrition.
The only drawback to using them for weight loss is that a smoothie is not as filling as the whole fruits and veggies, so you might find yourself very hungry.
Instead of pie or cake for dessert, offer fruit-based fare like fondue, fruit cocktail, yogurt parfait, or, simply a fresh piece fruit. Not only will this reduce the fat and calorie content of your meal's finale, most folks find fruit more refreshing than sweets.
I stared blending vegetables and fruits a few weeks ago. It is amazing how much more energy I have every day now, how refreshed I feel, and how much more my complexion glows! Making these fruit and veggie smoothies has really changed my life.
I've had the most success with about 1/3 fruit and 2/3 vegetables. I've tried making vegetable and fruit smoothies with kale, blueberries, and lime, or carrots, apples, and water, or persimmon, carrots, and lime. These three have been the best combination fruit and veggie drinks. The worst combinations had lettuce or cabbage -- making the drink too bitter overall.
I haven't noticed any weight loss yet from the fruit veg smoothies, but am optimistic that that could happen to a person with a different pre-smoothie diet. Before blending, I already ate pretty well.
Today, my smoothie was 3 stalks of celery, two handfuls of spinach, 2 cups of frozen mixed berries from Costco (blueberries, blackberries, and raspberries), and 1 cup water.
Delicious! Filling! The celery cuts down the sweetness, and the mixed berries mask the spinachy iron aftertaste.
All in all, I've lost about 5 lbs from having these kinds of drinks at breakfast over the last few weeks. While I haven't lost a ton of weight, I've literally not exercised or change my lunch and dinner eating. Most importantly, I just feel better, have more energy, wake up more easily, fall asleep more easily.
Re: Smoothies for weight loss? 
