exploring the D.A.S.H. diet

I've been hearing a lot lately about the D.A.S.H. diet and how good it is for lowering high blood pressure and maybe even loosing or controlling weight.  It's been ranked as one of the best diets for overall health, so of course I was curious.  I bought an inexpensive book on Kindle and have read a little about it.  It looks like it involves eating lots of fruits and vegetables, low fat dairy products, minimal amounts of lean meat, nuts, whole grain breads and other good stuff.  It also stresses lowering your salt use.  So far, so good.  I could go along with a lot of what they suggest and I appreciate that the book suggests starting slowly with one meal a day that follows the diet.  However, they don't seem to approve of butter. Hummm, low salt and no butter - this doesn't bode well for my famous salt and pepper buttery popcorn. I may have hit a snag.