Why Is It Some People...

Its not really about wanting to be 100%. You would like to eat just 2 chocolates but some people can't seem to stop at 2 and it reignites cravings. This is a good article among other things, cue exposure:

"Cue exposure can also be used to weaken the our response to powerful stimuli. Here we tap into the complexity of the cue network. In real life, each unconditioned stimulus tends to be associated not just with a single stimulus but with with a whole set of conditioned stimuli or cues, which I will call the cue network.

A great example is our appetite and eating behavior. The unconditioned response of food cravings results not only from the mere presence of food, but from the whole set of sensory cues that precede it and coincide with it, and are sequenced over time. This includes the immediate flavor, the appearance, the aroma prior to eating, preparation of the food, the social situation, the time of day, etc. We will only partially succeed in extinction or counter-conditioning if we focus only on just the most obvious or immediate unconditioned stimulus, e.g. the food itself. We must also deal with all the auxiliary, contextual clues.

The best way to do this is to deliberately expose ourselves to these cues without allowing any reinforcement. We should go up to the food, look at it, smell it, and spend time with the person preparing it. We can visit the bakery, walk through good restaurants and markets, all without eating.

This is the opposite of the usual advice to dieters: clear your refrigerator and pantry of tempting food, or go off to a “fat farm” to lose weight without temptation. You are then failing to learn how to avoid responding to the full set of problem cues in the most realistic context that they are likely to occur."
http://gettingstronger.org/psychology/

"I long for such a day as I can have anything in my home, food wise, and be able to just have a little when I fancy it and stop after that little. "

That's why that link I posted may help - its a strategy to reverse the behaviour.

"This is the opposite of the usual advice to dieters: clear your refrigerator and pantry of tempting food, or go off to a “fat farm” to lose weight without temptation. You are then failing to learn how to avoid responding to the full set of problem cues in the most realistic context that they are likely to occur."
http://gettingstronger.org/psychology/

Its not really about wanting to be 100%. You would like to eat just 2 chocolates but some people can't seem to stop at 2 and it reignites cravings. This is a good article among other things, cue exposure:

"Cue exposure can also be used to weaken the our response to powerful stimuli. Here we tap into the complexity of the cue network. In real life, each unconditioned stimulus tends to be associated not just with a single stimulus but with with a whole set of conditioned stimuli or cues, which I will call the cue network.

A great example is our appetite and eating behavior. The unconditioned response of food cravings results not only from the mere presence of food, but from the whole set of sensory cues that precede it and coincide with it, and are sequenced over time. This includes the immediate flavor, the appearance, the aroma prior to eating, preparation of the food, the social situation, the time of day, etc. We will only partially succeed in extinction or counter-conditioning if we focus only on just the most obvious or immediate unconditioned stimulus, e.g. the food itself. We must also deal with all the auxiliary, contextual clues.

The best way to do this is to deliberately expose ourselves to these cues without allowing any reinforcement. We should go up to the food, look at it, smell it, and spend time with the person preparing it. We can visit the bakery, walk through good restaurants and markets, all without eating.

This is the opposite of the usual advice to dieters: clear your refrigerator and pantry of tempting food, or go off to a “fat farm” to lose weight without temptation. You are then failing to learn how to avoid responding to the full set of problem cues in the most realistic context that they are likely to occur."
http://gettingstronger.org/psychology/

This makes sense!

I never bring ice cream into my home.....If I want it I will buy it as a treat when I'm out.......I only buy small chocloate bars another for one serving otherwise I would eat the whole lot at one sitting..............

as a few have said,

i have found it easier by letting myself have some if i want, get a taste and stop!

i can take three days to eat a single choclate biscuit!! lol

sometimes i think the more that you completely try and stop yourself the more likely you are to fail.
work it into your calories so you can have a little bit when you want.

i have lost forty pounds in 13 weeks and have a choclate biscuit most nights and at easter i went crazy with chocolate! ooops!

I just had two cheat days to try to shock my body out of a plateau and it's way more difficult to stick to my diet plan now!

For me I sit there and think about why I want the food I am craving then I think of the healthier alternative. If the thinking doesn't work then I sit there and say to myself out load "you don't need this" over and over again until I'm so sick of saying it LOL usually by then I've forgotten I don't really want it :-) Willpower is a muscle and must be used.