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To reach this conclusion Dr Fonken split her murine subjects into three groups. Some were kept in cages lit constantly, so as to resemble a never-ending overcast day. A second group lived in conditions akin to their natural habitat, with 16 hours of overcast day-like light, followed by eight hours of darkness. The remaining rodents were also exposed to a cycle, but the dark was replaced with a dim glow equivalent to the twilight at the first flickers of dawn.
Over the eight-week period of the experiment the mice in the first and third groups gained almost 50% more weight than those exposed to the natural light-dark cycle. They also put on more fat and exhibited reduced tolerance of glucose, despite eating comparable amounts of food and moving around just as much.
The only thing that seemed to differ was when the mice ate. In the wild, mice are nocturnal. Unsurprisingly, then, those in the quasi-natural conditions consumed only about a third of their food in the “day” phase. For a mouse exposed to the twilight cycle, however, the figure was over 55%.
In a follow-up experiment, Dr Fonken looked at whether the timing of food consumption alone could explain the observed differences. It turned out that those forced to eat during the “day”—ie, out of whack with their biological clock—did indeed gain about 10% more weight than those fed at “night” (be it dark or just dim) or those with uninterrupted access to grub.

A. 어휘
split 쪼개다, 찢다. murine 쥐의, 쥣科(과)의.
subjects 피실험자, 실험재료, 실험대상. light-lit-lit 불을 켜다.
overcast 구름 낀 것 보다 어두운(gray), 잿빛의.
a never-ending overcast day 하루 종일 잿빛인 날.
akin to ...와 동등한. habitat 서식지. rodents 齧齒類(설치류).
exposed 노출되다. glow 白熱(백열), 灼熱(작열), 紅潮(홍조).
equivalent 동등한. twilight 황혼. flickers 明滅(명멸)하는 불빛, 번득임.
dawn 새벽. reduced 감소된. tolerance 耐性(내성), 허용량.
comparable 필적하는. when the mice ate (명사절) 쥐가 먹이를 먹는 시간.
nocturnal 야행성. figure 數値(수치). quasi 유사한, 擬似(의사)의.
quasi-natural conditions 자연과 유사한 조건.
phase 현상, 局面(국면), 상황. follow-up 後續(후속).
whack 좋은 상태, 형편, 세게 치기. out of whack 정상에서 벗어난.
uninterrupted 중단되지 않는, 연속되는. access 접근.
grub 음식물, 구더기.