Blending speeds up digestion and reduces satiety versus eating whole fruit, but (unlike juicing) I haven't seen any evidence that it destroys fiber. Do you have a reference?
Apparently the lowered glycemic index for foods
of a smaller particle size is only for starchy
foods (smaller particles hydrolyze easier,
making them higher GI). So while my statement
may have held true for starches, it wouldn't for
fruits. I have no idea about smoothies! It's out
of the scope of the paper, though, so all we can
say is that the study suggests that juicing
increases diabetic risk and whole fruits lower
it.
http://www.slate.com/articles/double_x/the_kids/2013/03/pure...