Some practical strategies that work for me are as follows:-
-go through your cupboards and throw anything of temptation away (biscuits, cakes, sweets etc,) Don't throw the food somewhere from which you can retrieve it
-when the pangs are felt go out for a walk and stay out until you feel stronger
-shop from a list , not randomly, and only add things you need. No extras and no treats until you feel you can control eating them
-when you get a pang, wait for ten minute, half an hour, an hour. Eke it out and you may well find the urge is gone
-distract yourself. Thinking and unhappiness are encouraging the wish to eat so read a book, listen to the radio or a storytape or phone someone
-if you find food in your hand walk to the bin and put it in with the other rubbish
Then, when you have got a grip plan a nice foody treat that is self contained for 'treat time'. My treat is cake with afternoon tea and I eat virtually no lunch to have it. Treats might be :- a Solero (99calories!), a mince pie, bananas or other fruit and some low cal ice cream, a wrapped biscuit (so you can eat ONE and not finish a packet.) Go with what works for you. If you can't control the treat time skip it altogether.
Finally, weigh yourself every day and respond to the information. If you have put weight on, skip a meal.