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