因为您需要它建立和维护精瘦的身体大量，吃含精瘦的蛋白质食品对健康好是关键的。

Eating lean protein is crucial to good health because you need it to build and maintain lean body mass.

youdao

那是当然。我很精瘦。精瘦的动物的肠线是最结实的。

Of course you were. I'm lean. Lean animals yield the toughest gut.

youdao

If you look at increasing weight as you go from left to right on this axis, lean people, overweight people, and obese people, the risk goes way up for death from cardiovascular diseases.

从X轴左边到右边,随着体重不断上升,精瘦的,超重的,以及肥胖人群,心血管疾病的致死风险也随之增加

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选