Why do so many Somalis have weak chin/jawlines?

Anyone else notice this? Older Somalis raised in Somalia have strong jawlines, while young Somalis raised in the West have more recessed chins. Not only Somalis have this though, I've noticed that a lot of Ethiopians and Eritreans have weak jawlines too. I think it's something to do with our diet in the West.
 

Guardafui

Beati Pacifici.
The inbreeding doesn’t prove much because Arabs and Asians are way more inbred than us and most of them have sharper jawlines and wrists than Somalis. I’d say diet plays a huge role.
 
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