Popular energy drinks trigger caffeine jitters.

• Position: Emergency Room Visits - Brief article

The growing popularity of energy drinks--and deaths linked to those products--Is fostering concerns about how much caffeine people can consume safely, according to Chemical & Engineering News. Associate Editor Lauren K. Wolf points out that stories have surfaced with increasing frequency in recent years about deaths and emergency room visits linked to caffeinated energy drinks. Sales of these products have grown from virtually nothing a decade ago to almost $10,000,000,000 annually.

Emergency room visits linked to energy drinks increased to 20,000 in 2011, up 36% from the previous year. The Food and Drug Administration is investigating, but manufacturers insist their products are safe.

It is tough to determine safe...