the researchers in the latest study showed an group of participants a lifestyle in which 60 percent of grams came from fat . the diet begun when the animals , all female , were 1 year old , which is middle - age in mouse lifetime . as expected , the children immediately developed marks of impending diabetes , with grossly enlarged corneas , and started to immortal very sooner than being fed a standard digest .
At the age of one year, male mice were fed with a diet in which 60 percent of calories came from fat.