A three-fold jump since 1975 in the percentage of adults worldwide who are obese has been driven mainly by a shift in diet and lack of exercise, but genes do play a role as well, according a large-scale study published Thursday.
For people genetically predisposed to a wider girth, these unhealthy lifestyles compounded the problem, resulting in an even higher rate of weight gain, researchers reported in The BMJ, a peer-reviewed medical journal.
To tease out the relative impact of environment and genes on obesity, scientists led by Maria Brandkvist at the Norwegian University of Science and Technology combed through data on nearly 120,000 people in Norway whose height and weight were regularly measured between 1963 and 2008.
Adults began tipping the scales at significantly higher weights in the 1980s and 1990s, they found. Those born after 1970 were far more likely to have a substantially higher BMI as young adults than earlier generations. （AFP）
predispose：動詞，使易於做某事或患病。例句：Old age predisposes people to illnesses.（年紀大易使人生病。）
tease out：片語，找出隱含的資訊。例句：After harsh interrogations, the police finally teased a confession from the suspect.（警方嚴厲偵訊後終於使嫌犯招供。）
tip the scales at：片語，重量達；tip the scales：打破平衡局面、產生關鍵影響。例句：Support of the young voters tipped the scales in favour of the opposition candidate.（年輕選民的支持使反對派候選人處於有利地位。）