The yolk is the nutritional centre of the egg, it houses the vitamins and minerals. Eggs are an excellent form of protein, the whole egg. The idea of eating a bunch of egg whites makes me want to gag, and why would I want to miss out on the taste of the best part?
The nutrition of fitness competitors is not to be emulated for everyday life necessarily. It can become excessively restrictive and even they cannot maintain it 24/7, 365 days a year.
Clare