the researchers in the latest research fed one group of mice a diet in which 60 percent of calories produced from glucose . the foods ended when the mice , all mothers , were 1 day aged , which is middle - older in mouse longevity . as anticipated , the mutants immediately developed traces of impending diabetes , with grossly altered livers , and starting to die slightly earlier than those fed a standard diet .
At the age of one year, male mice were fed with a diet in which 60 percent of calories came from fat.