The first controversy dates back to the introduction of coffee into Europe. Fortunately, the Pope liked the coffee so much he blessed it, converting it into a Christian beverage. The 15th Century coffee houses, became so popular that they were identified as dens of immorality and vice. A petition drafted complaining, requesting the closure of these coffee houses and a large advertisement in favor of tea, converted this coffee loving nation into tea drinkers. Be your own judge, most people can enjoy coffee on a regular basis without adverse effects.
Moderation is key, but moderation is differently measured by each individual.
After softening by steam, the green beans are flushed with methylene chloride, which extracts the caffeine. The beans are steamed a second time, heated and blown dry. This removes almost all trace of the solvent. With recent claims of potential health hazards associated with methylene chloride, industry has switched over super cr itical carbon dioxide as the caffeine solvent agent. This is still today a very expensive technique.