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 .
Toxic doses, over 10 grams per day for an adult, are much higher than typical dose of under 500 milligrams per day. A cup of coffee contains 80â175 mg of caffeine, depending on what bean (seed) is used and how it is prepared (e.g. drip, percolation, or espresso).affeine's biological half-life â the time required for the body to eliminate one-half of a dose â varies widely among individuals according to factors such as pregnancy, other drugs, liver enzyme function level (needed for caffeine metabolism) and age. In healthy adults, caffeine's half-life is between 3â7 hours.