There is no requirement for....

caffeine in the human diet. Zero. It is just not needed.

You know what else is not needed? Us to be in Afghanistan. Think of the "blood and treasure" used since 2001 and answer yes or no to the following questions:

-Is the taliban still in control of the country's government?
-Has it been replaced by a secular or democratic alternative?
-Is bin Laden dead?
-Is America's standing in the world better than before the war?
-As the largest producer of heroin in the world, has this been stopped?
-Are women and children in Afghanistan better off in society?
-Do you realize the '3 cups of tea' novel has been debunked?
-Has state sponsored terrorism in the area decreased?
-If ended today, could a clear cut winner be decided?
-Do you know someone who has served there or perished there?
-Could the area again be a safe haven for international terrorists?
-Does a majority of the population want us there?
-Has there been any appreciable increase or creation of trade and industry? Any sort of economy beyond the territorial level?

At one time I was all for an intervention, or call it war if you will, in Afghanistan. Now I am not so sure.....