"When these tea and coffee users meet together for socialentertainment, the effects of their pernicious habit are manifest. All partake freely of the favorite beverages, and as the stimulating influence is felt, their tongues are loosened, and they begin the wicked work of talking against others. Their words are not few or well chosen. .. All these unkind criticicisms, these exagerated reports, these envious feelings, expressed under the excitement of the cup of tea, Jesus registers as against Himself." E.G. White, Counsels on Diet and Foods,421.
"Tea and coffee drinking is a sin, an injurious indulgence, which, like other evils, injure the soul. These darlilng idols create an excitement, a morbid action of the nervous system; and after the immediate influence of the stimulants is gone, it lets down below par just to that degree that its stimulating properties elevated above par." Idem, 421.
"Never take tea,coffee, beer, whine, or any spirituous liquors. Water is the best liquid possible to cleanse the tissues." Counsels on Diet and Foods, p.421.
"Tea, coffee, and tobacco are all stimulating, and contain poisons. They are not only unnecessary, but harmful, and should be discarded if we would add to knowledge temperance." Idem, 421.
There is more on this topic in that section of the book. All who are seeking to live up to the light given by the Lord on health-reform should make sure they have this book and read it from cover to cover.
When we talk about coffee, either it's regular or decaffeinated, the bad effect of it aside from caffeine is-- it INCREASES BLOOD CHOLESTEROL LEVEL. And, as we knew, high cholesterol may cause atherosclerosis that may lead to coronary arterial disease, other heart problems, high blood pressure, stroke and, or circulatory problem.