What this tells me is that you are not in control. You haven't developed the mental discipline it takes to overcome your mental urges. You see the process to become healthy is the same process you use to succeed in anything you want to succeed in.
Process number 1: You must know where you desire to go. You must know what it is you desire to achieve. If you are at 270 pounds and want to be at 200 pounds then 200 pounds is where you desire to go, what you desire to achieve.
Process number 2: You must know what your achievement look like. Find pictures of what you would think you would look like at your new achievement. The pictures do not have to be you, they are just images to remind yourself mentally what your destination look like. Place these pictures where you can see them often.
Process number 3: Develop an affirmation that sums up your achievement in a statement. This affirmation has to be stated in the present tense and it has to be stated only with positive wording. Example: I am so happy now that I am at my ideal weight, I feel good and I am full of energy. Or, I am in in perfect health. Never state I am and something negative at the end.
Process number 4: Become objective to your thoughts and emotions. Practice being still and letting everything go. The more you do this, you will become aware that thoughts will constantly come up to try to get you engaged, but in your practice just watch those thoughts arise, practice just watching them, as you observe them bring your attention back to stillness. If you realize you have actually engaged in the arisen thoughts, just gently bring your attention back to a stillness, do not struggle with it, do not get frustrated. Over time you will be able to master this.
These processes will help you obtain the self discipline necessary to achieve any desired goal or object you desire to achieve. The more you become still, the more you will realize how the thoughts that arise and what you are saying to yourself are sabotaging your efforts. Someone once told me that, "I've tried affirmations and they didn't work". My question to them was, "how often you stated your affirmation". They said "3 or 4 times a day". My response was, "I understand why you are having the issue, if you are only stating your affirmation 3 or 4 times a day, think of how many negative affirmation you are stating a day, this could be in the several hundreds, therefore voiding out any glimmer of hope for your achievements to be realized". Your spoken word to yourself is powerful, so be careful what you say. I would also state here be careful what you visualize as well, always see a positive outcome mentally regardless of the circumstances. I know this takes practice and will not happen overnight, but start walking in the right direction and you will eventually arrive at your destination.