I think it’s because most smoothies are made with organic raw vegetables and fruit. And when you consume raw vegetables and fruit, you have more fibre in your body- this means that you will most likely excrete more, have less drag and toxins in your body when you consume fresh raw smoothies regularly. And when your body starts “detoxing” from the fresh organic fruit and vegetables, you’ll more likely feel lighter. And when you feel lighter you’ll most likely want to keep up with this positive loop so you make healthier food choices and eat better. Plus, most of us don’t chew enough so blending the fruit and veggies aid our digestion system. Of course, the benefits of raw vegetables and fruit alone may require another essay. But to sum up, when you eat raw foods, your chances of staying/being at your ideal weight are higher given your healthier food choices – by virtue of this you’d probably have cut down some processed junk in your die, the calorie concept may not apply to raw foods – this is debatable but I find this concept quite interesting – Stay Lean and Fit Without Counting Calories?