the researcher in the latest study fed an group of mice a feeding in which 60 percent of calories came from fat . the diet started by the mice , all males , were 1 decade old , which is middle - age in rodents length . as expected , the rabbits soon developed signs of impending diabetes , with grossly elongated livers , and started to dies much sooner than mice served 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.