the authors in the latest study fed one band of mice a diet in which 60 percent of carbohydrate came from fat . the workout started when the mice , all pairs , were 1 year early , it is middle - age in mouse longevity . as expected , the mice soon manifested indicators of impending insulin , with grossly enlarged livers , and started to die no sooner 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.