Sorry, I missed the most important part! They talk about how the calorie restricted (CR) rats had such a low quality of life, depression, irritability, etc.. but the intermittent fasting rats were much more balanced even though they were eating the same amount of food..
Here is the whole article.. http://www.fourhourworkweek.com/blog/2008/03/02/postponing-death-caloric-restriction-vs-intermittent-fasting-part-1/