An anonymous reader writes: According to a new study published in the Lancet, obese people now outnumber the underweight population for perhaps the first time in global history. Majid Ezzati, an environmental health researcher at Imperial College London who led the study, analyzed data from 1975 to 2014 across 19.2 million adults from 186 countries. They found that over the 40-year-span, the proportion of obese men worldwide more than tripled, to roughly 11 percent, and the proportion of obese woman more than doubled, to about 15 percent. Researchers estimate 18 percent of men and 21 percent of women worldwide will be obese by 2025. What some may consider more surprising is that more than 25 percent of the world's severely obese men and almost 20 percent of the world's severely obese women are American. However, the rapid rise of obesity in developing nations is most concerning as it's more difficult for obese people to modify their diet and have access to medication.