Kenyans and Ethiopians tend to get even lower levels of protein in their diets and their Olympic athletes are pretty damned quick. As running sub 3 minute kilometers back to back for a whole marathon.

Their macro-nutrient is generally about 10%-15% fat, 10% protein and 75%-80% carbs, and mostly from plant sources.

http://www.active.com/running/Articles/Eating_practices_of_t...