They say passengers who sit for hours need to drink plenty of water not liquids that contain alcohol or caffeine.

VOA: special.2009.07.14

They suggested better labeling with the amount of caffeine and other ingredients clearly listed on the drink.

VOA: special.2009.07.22

The directions also advise people to limit caffeine products and to drink only half the bottle if they want a moderate amount of energy.

VOA: special.2009.07.22

People who have many drinks with caffeine,like coffee, experience more stress and produce more stress hormones.

VOA: special.2009.03.24

Doctors say people should limit the amounts of alcohol and caffeine in their diets.

VOA: special.2009.03.24

They appeal mainly to young people and are fueled mainly by caffeine.

VOA: special.2009.07.22

Nineteenth-century cyclists and others used alcohol,caffeine,cocaine -- even strychnine,a strong poison.

VOA: special.2011.04.12

And three: the amount of caffeine varies greatly.

VOA: special.2009.07.22

Doctors sometimes use caffeine to treat migraine headaches.

VOA: special.2010.03.30

Interestingly, caffeine also can cause some migraines.

VOA: special.2010.03.30