A recent mouse study at the UC Davis School of Veterinary Medicine sheds light on those questions by demonstrating that a high fat, or ketogenic, diet not only increases longevity but also improves physical strength.

最近，加州大学戴维斯分校的兽医学院在老鼠身上做了个实验，这个研究给刚刚说的问题提供了一些全新的视角：高脂肪饮食，或者说叫生酮饮食，不仅能促进长寿，还能提高身体的力量。

"We expected some differences, but I was impressed by the magnitude we observed -- a 13 percent increase in median life span for the mice on a high fat vs high carb diet. In humans, that would be seven to 10 years. But equally important, those mice retained quality of health in later life."

我们的确预想到会有这方面的差异，但我们观测到的差异幅度大得让人吃惊——这些采取高脂肪饮食的老鼠与采取高碳水饮食的老鼠相比，平均寿命增长了13%。换算成人的寿命，就是多了7到10年。同样重要的第一点是：这些老鼠在晚年也能保持很好的健康状况。

Ketogenic diets have gained popularity for a variety of health benefit claims, but scientists are still teasing out what happens during ketosis, when carbohydrate intake is so low that the body shifts from using glucose as the main fuel source to fat burning and producing ketones for energy.

生酮饮食法声称自己有很多种健康方面的好处，因此变得越来越受欢迎，但科学家们还没搞清楚生酮过程中到底发生了些什么。这个过程指的是：当你摄入碳水化合物的量低到一定的程度，你的身体就会停止使用葡萄糖来做主要能源，而是转而分解脂肪，并产生酮类物质。

"We designed the diet not to focus on weight loss, but to look at metabolism," Ramsey said. "What does that do to aging?"

Ramsey 说：“我们设计这个实验的时候并不是着眼于瘦身，而是要研究新陈代谢的过程，看看它对衰老有什么影响。”

"In this case, many of the things we're looking at aren't much different from humans," Ramseysaid. "At a fundamental level, humans follow similar changes and experience a decrease in overall function of organs during aging. This study indicates that a ketogenic diet can have a major impact on life and health span without major weight loss or restriction of intake. It also opens a new avenue for possible dietary interventions that have an impact on aging."

Ramsey 表示：“在这件事上，人类的情况也会差不多。从基础的层面讲，人类经历的各种变化很相似，我们身体组织的总体机能随着衰老而不断减弱。这项实验说明，即使不减重、不限制卡路里摄入，生酮饮食也能对我们的生命产生重大的影响。这甚至还说明，我们可以通过干预饮食方式来应对衰老。”