Our new analysis shows that the American middle class lost ground in the vast majority of metropolitan areas from 2000 to 2014, and the shares of adults in the lower- and upper-income ranks rose in most areas. There was more movement into the upper-income tier in about half the areas, while in the other half there was more movement downward.
http://www.consumergenetics.com/caffeine_test.php. The lethal dose of caffeine is 2 grams of caffeine per day, that is, 80-100 cups of coffee a day.For slow metabolizers of caffeine, the lethal dose of caffeine can be lower.t's dependent on weight & individual sensitivity & estimated to be about 150-200 milligrams/kilogram of body mass. ChaCha on! [ Source: http://www.chacha.com/question/what-is-a-lethal-dose-of-caffeine ]. More Answers to  What is a lethal dose of caffeine .
Letâs use 80kg as an average. 2. A single cup of coffee on average contains about 250ml of water, and about 135mg of caffeine (link). 3. Lethal dose (oral intake for a rat, which has similar metabolism â although we should note, not identical metabolism) is about 192 mg/kg for caffeine and 90 mL/kg for the water. 4. However, the other part of the equation is we need to evaluate involves rates of elimination.