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 .
Caffeine is the most widely used psychoactive stimulant, targeting the central nervous system and heightening your brainâs feeling of alertness. According to the FDA, 400 mg per day of caffeine (thatâs about four cups of coffee) is a safe amount of caffeine for healthy adults. But too much caffeineâ500 to 600 mgâcan be dangerous, causing restlessness, tremors, irritability, insomnia and stomach upset.