So OK, the questions just keep on coming: why do athletes eat raw eggs? That from reader Nan. I’m not sure athletes eat/drink eggs like Rocky anymore, however I do know why eggs are considered a “perfect” protein by many nutritionistas. It has to do with their so-called “bioavailability.” It’s a long word but the idea behind it is simple. The food world is full of different kinds of edible proteins, but the degree to which the body can break them down and use them varies. Some proteins break down very inefficiently in the digestive tract, the result being that not all the nutrients they contain (specifically their nitrogen) can be absorbed. The most “perfect” proteins are those that give up the most nutrients. Egg proteins are 97% bioavailable which is, you know, a lot.