I used to consume huge amounts of coffee—morning, noon, and night. Whenever I tried to cut back on my consumption, I would suffer from violent headaches. I even tried to taper off by using decaffeinated coffee, but with the same result—headaches.
Then I began a serious study of Christian Science. In addition to reading the weekly Bible Lesson on a daily basis, I would also spend a few more hours each day reading Science and Health with Key to the Scriptures by Mary Baker Eddy, along with her other writings. I believe this concentrated study had the effect of purifying my thought and bringing me more in line with the absolute truth that the very core of my being is spiritual.
I was very busy during this period, getting a house that my wife and I had purchased into move-in condition. In fact, I totally forgot about the coffee issue until I suddenly realized that I hadn't drunk any coffee at all for about a week—and I'd experienced no adverse effects.