Ever look at Mongolian cuisine? That's the bulk of what they eat. Most of those guys seem pretty healthy to me.
Meat (non-processed, no sugary sauce or gravy), and dairy (plain, fermented, no added sugar). Those are kind of "neutral" foods. If that's all you eat, meaning you don't eat any crap, you're much better off health wise than if you eat crap and try to also eat a bunch of veggies, fish, fruits, legumes, etc.