Many of the websites that deal with this are based in the U.S. and so are of limited practicality for U.K. residents. My own interest in Budwig has been in treating diabetes 2 but there are others that are interested in it as regards cancer and heart disease prevention, waist-line reduction, sports performance enhancement and many other benefits.
I would recommend reading the Budwig Cook Book (see links page) for a fuller description.
In 2011 I was diagnosed with diabetes 2 and followed the standard NHS (high carb) diet. By early 2012 my readings had actually gone up and my doctor (who is very good) prescribed insulin tablets.
Before visiting the chemist I thought it would be a good idea to look for a treatment that did not involve the need for drugs. Coming across the Budwig Protocol on the internet, I was impressed with the mechanics and analysis of the problem. Initially I was skeptical and had a difficult time sourcing the materials and getting the mixture right. However there were soon all sorts of improvements to my general health.