Yes, they eat just meat, but smoking prevalence is over 50% [0], and alcoholism is rampant [1].
Bad example, to be honest. In fact, liver cancer can be directly attributed to drinking.
A life expectancy of 70 years under such conditions is actually astonishing.
[0]: https://www.who.int/tobacco/media/en/Mongolia.pdf
[1]: https://www.npr.org/templates/story/story.php?storyId=112485...
