Studies have shown that if you eat eggs for breakfast you will consume, on average, 400 calories less during the rest of the day than if you have a carbohydrate-only start to the morning.
Research carried out over eight years, by dietician Dr Carrie Ruxton, showed that those eating eggs, as opposed to cereal, felt fuller for longer and therefore ate less later on. This is presumably because eggs are high in protein, which stops you feeling hungry, but they also, apparently, contain quite a specific sort of protein at that, which works well on feelings of satiety. More research is required, but eggs may also possibly affect some appetite-related gut hormones aiding feelings of fullness. In the meantime, they certainly contain Vitamin D which regulates the amount of calcium and phosphate in the body and promotes strong bones and teeth. Hurrah!
(NB Eggs are also excellent as a hangover remedy and, together with cress and mayonnaise, make the very best sort of sandwich.)