If you fill your hunger with protein first what are you most likely not going to eat a huge amount of? It takes roughly 24.6-26 calories burned to digest every 100 calories of protein yet it only takes roughly 3.8 to 4.2 calories burned to digest every 100 calories of fats/carbs so are you figureing out yet why my trainees are always hot like a furnace and stay reasonably lean eating gross amounts of food?

If I can add something here to further back Dante's theories:
Eating protein first in a meal increases the effeciency of digestion and a greater overall amount of protein as an end result in from a meal. In short a greater amount of aminos make it to the blood stream. Everytime I have written about this in the past few years people always are like "WOW I learned something new today".

I call it eating for function.

The function of the digestive system.
I eat proteins first for 2 reasons-that digestive system is physiologically geared that way and it improves the effeciency of digestion and a greater overall availability of proteins/aminos from food for the body to use.
Carbohydrates are digested 30% in the mouth with the salivary enzyme amylase and of course chewing.
CARBS aren't digested in the stomach=they just sit there and slowly pass into the small intestines where the pancreatic enzymes do 70% more and complete the process.

Fats are the same way if eaten first or mixed with carbs will sit there and clog up digestion.
Proteins are primarily digested in the stomach. Therfore, eating proteins after these foods will result in a reduced amount of protein digestion-leaving some incompletely digested and unabsorbable and therefore lost.
This in turn causes the undigested protein to be pulled into the small intestine reducing the protein effeciency of your meal and contributing to the mass of your colon.

You want something worse? We are set up by traditional eating to fail.
Go out to a steak house. First thing you get is your salad-THAT is the last thing you want to eat in a meal after the steak and then the potato.
Cellulose is undigestable by the human body and will really clog up the process reducing the effeciency of digestion and your meal itself.

As mentioned previously proteins speed up the metabolic rate more than carbs and fat. Concerning basal metabolism proteins speed it up 30%, Carbs and fats 10%. The mere process of digestion and absorbtion of protein races the metabolism and will increase anabolism in an advanced athlete.

Now granted you can eat a huge meal like a Mcdonalds Combo meal mix it all up and it will get digested but it will interfere with feedings and the effeciency of the meal will be less and eventually leadto a lot of adipose tissue gain.

There are reasons we eat Protein and Fat together and protein and carbs. Insulin. Eating fat and carbs are a death warrant to bb'ers when consumed together and lays adipose tissue down as easily as Home Depot lays down cheap carpet.