专四听力训练83：Eat Less,Live Longer
Half of the monkeys were permitted to eat as much as they wanted. The other half ate a controlled diet.
The researchers found that thirty-seven percent of the monkeys that ate as much as they wanted had died of causes related to aging after twenty years. In comparison, only thirteen percent of the monkeys on restricted diets had died.
Extended life was not the only observable difference between the two groups. The monkeys that ate less had half the amount of heart disease and cancer.
In addition, there is also a difference in the appearance The monkeys that ate less look younger and healthier than fatter monkeys on a normal diet.
The researchers say this study is not complete and that they will continue to observe the remaining monkeys throughout their lives.