I too have found Judy's words to be true.  It is very difficult to legislate dietary change through policies and procedures.  What does work however, is education that is interesting and fun.  It is also caught, just like management principles that leadership exhibits.  When you have a church feed - show up with some very tasty dishes that are healthy and taste great.  Lead by example and the sheep will follow.  Offer an educational program on wellness and healthy diets.  I have included three sites below of material that I have used with success.

The Holy Cow book does not have any teaching material with it but is easy to make up material.  Out of everything I like the Maker's Diet and Dr. Colbert's material the best.

I hope that this helps.

Blessings to you on your endeavors!

Roger