This is not exactly scientific but....
One of my interests is archery. I just downloaded an e-text
from project Gutenberg. It is one of the all-time classic
books on archery.
Title: Hunting with the Bow and Arrow Author: Saxton Pope
I ran into the following on the very first page of the text.
***
"When the white pioneers of California descended through the
northern part of that State by the Lassen trail, they met
with a tribe of Indians known as the Yana, or Yahi. That is
the name they called themselves. Their neighbors called them
the Nozi, and the white men called them the Deer Creek or
Mill Creek Indians. Different from the other tribes of this
territory, the Yana would not submit without a struggle to
the white man's conquest of their lands.
The Yana were hunters and warriors. The usual California
natives were yellow in color, fat and inclined to be
peaceable. The Yana were smaller of stature, lithe, of
reddish bronze complexion, and instead of being diggers of
roots, they lived by the salmon spear and the bow."
***
The root-eaters (high-carb dieters) are fat and lazy with a
sickly yellow colour and the hunters are thin and lithe with
a healthy reddish bronze complexion.
TC