Can we put a number on the evolutionary importance of lactose tolerance?

我们是否可以用数字来说明乳糖耐受性的重要性呢？

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Genetic changes that enable lactose tolerance have been detected not just in Europeans but also in three African pastoral societies.

实现乳糖耐受力的基因变化不仅仅只在欧洲，也在三个非洲的放牧社会被发现。

youdao

Lactose and glucose tolerance tests, intestinal transit time and test for intestinal bacterial overgrowth were performed in 26 postgastrectomy patients using CM type. Hydrogen gas Microlyzor.

用CM型氢气微分析仪对26例胃大部份切除病人作乳糖及葡萄糖耐量测试、小肠传递时间的测定及小肠细菌过度生长的检测。

youdao

He's a sort of evangelist for lactose tolerance, talking without irony of the "in-store theatre" of how his product is presented.

BBC: Shelves in a shop

One gene that spread in many parts of Europe along with the migrants gave adults lactose tolerance, or the ability to digest milk.

WSJ: Migrations Spurred Agriculture Spread, Studies Indicate

The paradigmatic example is lactose tolerance.

WSJ: Matt Ridley on Human Culture's Effect on Genes | Mind & Matter