If we're going to get all nutritional about it, a355ml can of Coke Zero contains 34mg of caffeine, Diet Coke is a little stronger at 46mg. See note about morning caffeine hit. There's also a little potassium citrate and acesulfame potassium in a Zero, about 60mg worth. See what I said about the metallic taste. I have the palate of a Michelin-star chef.
