Three months may not seem a huge difference, but according to Dr Christakis it is comparable to the benefit an elderly person can expect from excercising or losing some surplus weight.

3个月可能并不是很大的差别，不过根据克里斯塔博士的研究，相比较老人们通过锻炼和减轻多余体重以期望延寿，3个月足以匹敌了。