Our school nurse (over 25 years experience), told me something very interesting that she learned in a training lately. Fertile eggs are lower in cholesterol that unfertile eggs. I don't know how that would make a difference, but she said it was supported in the literature they were given to read during a training concerning obese students and healthy suggestions to give their parents. I don't know if it's true or not, it's just observation on my part that I found interesting and please no flaming or making rude statements this nurse is a lifetime friend of mine.