آزمون های کارشناسی ارشد باستان شناسی زبان عمومی و تخصصی (انگلیسی) امتحانات 93-86 - بخش (4)

Our hunt for caloric restriction mimetics grew out of our desire to better understand calorie restriction`s many effects on the body. Scientists first recognized the value of the practice more than 60 years ago, when they found that rats ----1----- a low-calorie diet lived longer on average than free-feeding rats ----2------------ a reduced incidence of conditions -------3-------. What is more, some of the treated animals survived longer than the oldest-living animals in the control group, -----4------ that the maximum life span (the oldest attainable age), not merely the average life span increased.Various interventions, such as infection-fighting drugs, can increase -------5--------, but only approaches that slow the body`s rate of aging will increase the maximum life span.