the researchers in the latest study feed one group of mice a diet in which 60 cent of calories came from exercise . the feeding started with the mice , all males , were 1 year younger , which is middle - article in mouse longevity . as expected , the mutants soon developed indications of terminal diabetes , with grossly enlarged liver , and started to life far sooner than mice in a modified diet .
At the age of one year, male mice were fed with a diet in which 60 percent of calories came from fat.