Research is preliminary(初步的), but several studies__3__people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.

　　In an editorial__4__this week in the British Journal of Sports Medicine, Elin Ekblom­Bak of the Swedish School of Sport and Health Sciences suggested that authorities rethink how they define__5__activity to highlight the dangers of sitting.

　　While health officials have issued guidelines__6__minimum amounts of physical activity, they haven't suggested people try to limit how much time they spend in a seated__7__.

　　“After four hours of sitting, the body starts to send__8_ _signals，”Ekblom­Bak said. She explained that genes regulating the amount of glucose and fat in the__9__start to shut down.

　　Even for people who__10__， spending long stretches of time sitting at a desk is still harmful.

　　Tim Armstrong, a physical activity expert at the World Health Organization, said people who

　　exercise every day—__11__still spend a lot of time sitting—might get more benefit if that exercise were spread across the day，__12__in a single bout.

　　That wasn't__13__news for Aytekin Can, 31, who works at a London financial company, and spends most of his days sitting __14__a computer. Several evenings a week, Can also teaches jiu jitsu, a Japanese martial art__15__wrestling, and also does Thai boxing.

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