You're anchoring incorrectly.

Full nutrition allows your potential to be realized, but it doesn't raise the ceiling.

Starving in early developmental phases is catastrophic to mental and physical growth.

So if the broad Black cap is 110, that explains africas failure, nobody was well fed enough to reach even that bar.

If starvation drops you 35 points, eliminating starvation still the most leverage option to raise IQ. Even if it'd never going to push any black past 110.