A lot of Somalis also have bad posture, a sort of forward head posture and and anterior pelvic tilt. This is common only in the west, back home this look does not exist.
It's basically the soft food, creating mouth breathing long faces and bad posture forcing the buttocks to stick out. It is the western high nutrition soft food that does not require a lot of chewing.
Also many western Somalis have allergies that lead to mouth breathing, bad posture and the above issues.
Even though many Somalis back home have the mouth breathing issue, they tend to be slim due to the heat. They also get a good amount of vitamin D, allowing them to have better hormonal profile and better slimmer bodies.