According to a recent study by researchers at the University of California Los Angeles, a diet rich in processed food and fat leads not only to excess weight but also to less motivation. Researchers found that rats on a junk food diet were significantly fatter than rats on a healthy diet. But the rats with the unhealthy diet also were less active and mentally slower. "Our data suggest that diet-induced obesity is a cause, rather than an effect, of laziness. Either the highly processed diet causes fatigue or the diet causes obesity, which causes fatigue," says lead researcher Aaron Blaisdell.

_{Disponível em:. Acesso em: abril de 2015.}

        
According to the text, it is possible to state that:

 
I. Rats which ate healthy food were thinner than the ones which ate junk food.

II. Laziness is a consequence from obesity.  

III. Obesity can be considered as an effect of laziness.

IV. Less motivation is one of the causes which make junk food ingestion attractive.

V. Rats on a healthy diet were more active.