One of the few things that has always stuck with me from growing up with very sporadic "Judaism" in my life is the fact that if you eat a big meal, you will be hungrier. And no, this is not because my bubba made enormous meals and we gorged ourselves. But actually, the day before Yom Kippur, the day of atonement and fasting, people eat inordinately large meals the night before to increase their hunger and suffering for the following day.
And for the entire medical and breakdown, check this article out. Leave it to The Wall Street Journal to get all technical, and crap.
Breakfast: Loading up on lean protein -- ideally from egg whites or a protein shake -- in the morning reduces hunger all day long. Eating muffins, bread, sweetened cereal and juice does the opposite. A study of 30 overweight women at Saint Louis University School of Medicine found that those who ate eggs for breakfast consumed 140 fewer calories at lunch, and ate less for the next 36 hours, compared with women who ate bagels in the morning.