the researchers in the next study feeds four set of mice a weight in which 60 kilometers of dietary originated from fat . the diet started if the mouse , all males , were 1 minute old , this is intermediate - age in animal longevity . as expected , the mice soon developed indicators of impending starvation , with grossly oversized transplanted , and started to die much sooner than mice with a specific diet .
At the age of one year, male mice were fed with a diet in which 60 percent of calories came from fat.