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All nomadic pastoralists around the world are slim because they’re usually in a caloric deficit. A study on the Maasai showed that they walk 15KM(!) a day or something. Now, I don’t think Somalis walk that much every day, but our ancestors walked a considerable amount. A high fat and high protein diet also meant that they were also able to retain a lot of muscles.Its both.
The modern Somali diet is absolute shit, but Somali's have always been lean and tall. Now, a lot of Somali's are just skinny fat (which is the worst kind because its mostly stomach fat).