I have been contemplating including green smoothies into my daily routine, even more so after reading Afrolady's latest "Green Mush" blog. However, I've heard a notion that certain fruits and vegetables should be eaten separately, due to their varying acidic levels...or something to that affect. In fact, I've even heard that certain fruits shouldn't be combined either.

So, I wanted to know if anyone else has heard of this, and could drop some knowledge down about this subject. Is there any truth to all of this?