>>212503572it's probably that they eat so little meat in general as opposed to eating lots of fish
the caloric intake in subsaharan africa is very low in general
also to be fair most of those countries aren't land locked, uganda which borders lake victoria, zambia which borders lake tanganyika (second lake in the world by freshwater volume), and the DRC (tiny shore but largely landlocked) which has the congo river and a bunch of lakes like lake tanganyika