the experiments in the latest study fed one group of mice a diet in wherein 60 percent of calories came from fat . the diet ended when the animals , all boys , were 1 year old , which is upper - age in pig age . as expected , the mice soon acquired signs of looming diabetes , with grossly shortened brains , and started to die much sooner than mice given a proper foods .
At the age of one year, male mice were fed with a diet in which 60 percent of calories came from fat.