Hmm... Well I can explain something that might inspire or motivate you, or make you annoyed at evolution... either way
Each time you react a specific way to a specific situation, you build up the neuron pathway that is responsible for that reaction happening... so... if you for instance eat an apple each time the phone rings, it will become easier and easier to do so since that specific chain of neurons grows more and more connected and more and more efficient.
This might sound a bit boring but what this means is that basically... if you write down on a piece of paper something like "remember not to eat in anger because of the weight" (to remind you) then for each time you stop yourself from over eating when you get frustrated with your weight, it will become easier.
The point of this is, first of all, if you keep doing a healthy diet, you will loose weight, and second, each and every time you do something (and survive) it becomes easier to do said thing. This is generally talking but... yeah.
This might be explained simpler with "habit, break it" but... I feel it inspires me to know that it is actually possible for every sort of person to change such a habit, it isn't because we're a "bad person" or "lack a spine" that it is hard, it is simply that you have developed a VERY efficient chain of neurons that makes you eat a lot when your weight frustrates you, time to rewire the brain
