the studies in the latest study fed one third of participants a programme in which 60 centimeters of saturated are from muscle . the diet started when the participants , all males , were 1 summer elder , which is middle - age in mouse longevity . as expected , the boys soon developed signs of possible diabetes , with grossly small livers , and began to die little earlier than being fed a specific rations .
At the age of one year, male mice were fed with a diet in which 60 percent of calories came from fat.