That's a lot of ignorance in one post.
DE is not powdered rock. [FONT=Arial,Helvetica][FONT=Arial,Helvetica][FONT=Arial,Helvetica]Diatomaceous earth is the remains of microscopic one-celled plants called diatoms that lived in the oceans and lakes, these deposits are mined from underwater beds or dried lake bottoms. [/FONT][/FONT][/FONT]They contain 15 beneficial trace minerals and silica, which gets absorbed into the blood stream, one of the benefits of silica is that it helps to destroy bad fats.
There has been countless studies done which confirm the reduction of waste order, internal parasites and better feed conversion (upwards of 20-30%), numerous other benefits were apparent as well.
There are producers, ranches, feedlots and training facilities across the country that feed DE, I know of several personally, and have seen the effects of feeding DE.
Texas A&M has done studies on the positive aspects of feeding DE.
University tests confirm DE intake in humans is associated with a significant reduction of serum cholesterol as well as low-density lipoprotein cholesterol and triglyceride levels being decreased.