Breaking a cat of food addiction?

My cat is absolutely insane for any form of human food. How do I break her of this horrible habit? She's only about 4 weeks old and will literally attack you over food. Before I even start to prepare a meal I have to lock her in another room. I have tried just simply raising my voice at her, slapping her on the nose (not hard enough to hurt her of course) and using a spray bottle to douse her when she gets too close. Not a single result yet she just recoils and comes back harder than before. Please help if you know anything about how to stop her from doing this it's an extremely difficult issue with living with 4 people because they don't want to take the time to put her up before doing anything, it's also easy to forget and she draws blood over it.