Caffeine and calories: Comparing energy drinks

Energy drinks deliver their jolt via caffeine and calories (in the form of sugar). Here's how much you get in 12 ounces of these beverages:

Red Bull

-- 114 mg caffeine

-- 160 calories

Monster

-- 120 mg caffeine

-- 150 calories

Coca-Cola

-- 34 mg caffeine

-- 140 calories

Pepsi

-- 38 mg caffeine

-- 150 calories

SOURCES: Beverage companies