But Chad Reissig says scientists do not know a lot about them and how they interact with each other and caffeine.

VOA: special.2009.07.22

Government advice is that pregnant women should be careful about their caffeine intake from all sources because it may effect the birth weight of their baby.

BBC: Coffee 'increases miscarriage risk'

The company said its energy drinks contain about 10 milligrams of caffeine an ounce, less than half the concentration of leading coffee-house brews.

WSJ: Investors Get Jittery Over Monster

And not because they have been educated about the dangers of a caffeine overdose - although there undoubtedly are such dangers - but because it would just be daft, what would be the point?

BBC: Viewpoint: Is the alcohol message all wrong?