The number of extremely obese adults -- those who are at least 100 pounds overweight -- has quadrupled since the 1980s to about 4 million .
The number of Americans considered extremely obese , or at least 100 pounds overweight , has quadrupled since the 1980s to a startling 4 million , the research shows .
John Logsdon , a board member , said that " human spaceflight had become a place where dissent was not welcome . "