"Our study suggests that such levels of fructose can indeed play a role in weight gain, favour fat deposition, and also contribute to physical inactivity," said Justin Rhodes, professor of psychology at University of Illinois in the US.

So the researchers studied two groups of mice for two-and-a-half months: one group was fed a diet in which 18 percent of the calories came from fructose, mimicking the intake of adolescents in the United States, and the other was fed 18 percent from glucose.

The results showed that the fructose-fed mice displayed significantly increased body weight, liver mass, and fat mass in comparison to the glucose-fed mice. Remarkably, the researchers also found that not only were the fructose-fed mice gaining weight, they were also less active.

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