You are not supposed to be "stuffing" your stomach.
I have been hearing lately that high fructose corn syrup contains a chemical that will signal to your brain that you are still hungry. Here is an article about a scientific study. http://www.sciencedaily.com/releases...1016074701.htm
To summerize. It is possible that Fuctose causes leptin resistance. Leptin is a hormone that causes the body to balance its energy use. In a person who has become leptin resistent, the leptin does not turn off the hunger switch in the brain, so no matter how much you eat, you will feel starved.
Another possibility is that your diet may be too low calorie. The Hypothalamus is in charge of regulating hunger and satiety. Low calorie diets cause less leptin to circulate in the blood stream. The low leptin makes you feel hungry. A genetic mutation can make leptin not work. Your hunger never shuts off and you eat until you are very overweight. http://www.annecollins.com/Weight_Lo...ht-control.htm
(another leptin link)
Sleep is another potential problem.
"In fact, have you ever experienced a sleepless night followed by a day when no matter what you ate you never felt full or satisfied? If so, then you have experienced the workings of leptin and ghrelin." From Web MD by Colette Bouchez
According to the article, not getting enough sleep will screw up your leptin signals, and your body will feel like you are always hungry.
So, you have 3 scenarios so far,
High Fructose Corn syrup in sodas or candy effecting leptin levels
Low calorie diet effecting your hypothalamus
Not enough sleep causing your leptin level to lower, causing hunger
Are you over weight? Is it possible you have sleep apnea? That can cause you to lose sleep without knowing it, and that would make the final scenario possible. Another possibility is partying all night long, drinking lots of colas, and not eating enough solid food.
Anyway, there are probably a dozen more "usual suspects."
It seems all these items are reverse-able. Eat more substantial meals (beans, potatoes and other heavy food), don't eat candy or drink cola, and get 8 hours of sleep per night at least.