In fact, according to obesity researcher Dr. Paul Ernsberger, Ph.D., who conducted a review of over 400 studies on the health implications of obesity, “there is widespread agreement that reduced adiposity plays little or no role in ... life-prolonging and cancer-preventing effects.†Even in studies of mutant mice, a number of studies have shown that the heavier animals in each treatment group live longer than the lighter ones, he said. Those mice bred for obesity who are overfed later in life to make them obese still live longer than controls, with “a continuous positive relationship between body weight and longevity.â€