The average person thinks approximately 50,000 thoughts per day. If more than half of these thoughts throughout the day are about food, your natural inclination is to be eating more than half the day

People who have the tendency to think frequently about food (whether they are on a diet, training for a competition, have a disease where food happens to be the center of it, etc) tend to eat more than those who only think about food when they're hungry.
While it is nearly impossible to know the reasons why you need to eat a particular food at a particular time, it’s very important to be in touch with that desire. Listen to the illusory voice of desire that says, "My urge to eat is something that must be filled." There is usually a reason within our body chemistry why we crave the foods we do. I've found from my personal experiences that before I binge, I start out ravenous. I legitimately want to stop being hungry. Then, if I allow myself to get more and more hungry, all rational decisions regarding food fly by and I'll eat huge, impulsive quantities of crap.
As everyone else said, sugar is addicting. For me, salty foods are addicting, too - it has been proven in some studies that salty foods are addicting because they make you want to eat more and more of 'em. And sweet/salty combos?!?! I might as well throw away the whole bag RIGHT NOW because I'll NEVER stop until it's GONE!
I don't think there is a DEEP, DARK psychological reason for binging in everyone (in some people, sure, but we're all different

). Stress is definitely a trigger, as is depression, and even a hard day's work as horsey mentioned above. I believe the closest thing to something deep and dark is the fact that some of us (for reasons sometimes unknown) have a tendency towards self-sabatoge. We achieve success and then feel like we somehow are not worthy or that it will not last. I know I have this tendency due to having a very rough childhood and a rocky early adulthood. Now that I am successful and (according to some people) attractive

, I have this fear that it will all be taken away. However, I do acknowledge the fact that thinking these thoughts is a highly counterproductive activity and try to focus my energy on to more positive things.
We ALL deserve success in our weight loss
