Caffeine might be listed under "Ingredients," but beverage companies aren't required to state how much caffeine content in the drink the product contains on its label.
We decided to do a little research through EnergyFiend.com and find out exactly how much is in today's most popular brands of sodas, energy drinks, energy shots, coffee and tea. We chose to look at all five categories so we could not only compare the caffeine content from brand to brand within each category but also examine how coffee compares to tea, energy drinks compare to soda and so on.
Unsurprisingly, energy shots offered the most bang for your buck, with the most caffeinated brand containing 140 mg of caffeine per fluid ounce. This was followed by espresso, at 51.3 mg per fluid ounce; followed by energy drinks, with the most caffeine-packed brand boasting 32 mg per fluid ounce; then tea at 10.6 mg per fluid ounce; and soda, at what shocked us as only 5.8 mg per fluid ounce.
We always assumed Mountain Dew ranked No. 1 on most caffeinated sodas, but Pepsi Max came in first. It may also surprise you to learn that even decaffeinated coffee has some caffeine in it, though the amount is negligible.
As with everything, it's important to consume caffeine in moderation. According to the Mayo Clinic, too much caffeine — more than 500 mg to 600 mg a day — may cause insomnia, nervousness, restlessness, irritability, stomach upset, fast heartbeat and/or muscle tremors. Caffeine can also interact with certain medications, such as ciprofloxacin, norfloxacin, theophylline and echinacea. To learn more, click here.
We selected only some of the brands whose data was listed on EnergyFiend.com, so if you can't find your go-to brands on these lists, click here to view more.