【課題】難易度:★★☆ Light regulates the body’s biological clock - priming an individual’s metabolism for predictable events such as meals and slumber. Previous research has shown that, in mice at least, the genes responsible for this can be manipulated so as to make the animals plumper, and more susceptible to the associated problems of diabetes and heart disease. It was not known, though, whether simply altering ambient light intensity might have similar effects.