Prior to a medical, a fitness test, or a elecrostat bodyfat test, it is standard protocol to ensure the avoidance of caffeinated drinks as it renders all readings/tests about as accurate as fairground fortune teller.
'Red Bull' and equivalent high caffeine/taurine drinks have been cited as contributory factors to several fatalities worldwide, and are illegal in Chille!
As for the caffeine/illegal stimulant connection being 'weak', well essentialy the stresses placed on the body are very similar- much less intense I grant you, but still similar.
The reliance on coffe as a staple part of the daily diet is an obsession that was until fairly recently peculiar to the north americas and their sacred 'pot of joe', now the whole western world seems to believe its incapable of surviving an hour without a cup of coffe
I dont think a cup of coffe is the greatest evil in the world, but it is a stimulant
legal/illegal they are what they are. Alcohol is a legal and almost encouraged part of british culture, but its still harmful if abused. Same with coffe. How many times do you hear someone say 'i just cant start my day without a coffe?' or 'I have a lot on, its gonna be a 3 pot day'? A dependance, physical or psychological on a stimulant, legal or illegal, is not a good thing. Especialy if that dependance and continual intake results in continual
artificial elavation of heart rate and blood pressure at rest.
People suffering heart conditions/desease are strongly advised to abstain from caffeine due to this additional stress.
As for the scientific research and its validity, you presented an article as conclusive research of caffeine's harmless benefits. I simply pointed out that behind the jargon lay nothing but hypothesis and conjecture.
Having clarified this allows people to make an informed choice, rather than taking something as gospel truth due to the use of scientific vocabulary.