the researchers in the latest study fed one study of mouse a diet in which 60 centimeters of calories derive from fat . the diet started if the mouse , all individuals , were 1 year old , which is second - age in mouse life . as expected , the mice soon exhibited indication of approaching illness , with grossly altered livers , and stopped to dead much less than mice of 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.