You don't have to explain anything from them and try to go down from their level of conciousness (they won't listen anyway).
Just remember this, "We are what we eat".
I believe Einstein also said that.
I've lost my book "Beyond the Superconcious Mind". There's an explanation about it on that book.
It's an Ananda Marga book...
... I used to be a Margii... Namaskar!
