Genes

We has found the culprit for that stubborn mid-body obesity:
Neanderthal genes. Recent studies show that the small
percent of Neanderthal genes carried by Europeans is larger than
expected.

This mingling of populations happened on European soil, at yet
unknown dates. Africans do not carry Neanderthal genes, and Asiatics very few.
These peoples migrated to Europe before Homo Sapiens, and
became paler skinned and haired while there ...

http://tempsreel.nouvelobs.com/sciences/20171005.OBS5626/vous-prenez-de-l-embonpoint-blamez-neandertal.html