Does that mean, taller people suffer more brain damage?

Tall = high protein generation after generation

At least that's what we find from Native American diet consisting of 65-75% animal protein and they were tallest at the time.

Genetically, they were Asians who moved out of Siberia into North America but Asians were and are still short.

The difference between them was their diet, environment not genes. Genes might have changed later.