Diet Plans, any help?

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I am needing to find a 1340 calorie diet plan. I am bad about just eating what is available so if i am limted to what i can eat then i will have more will power. I am not too picky on food but have a limited budget and do not have a lot of time to cook. I am a second semester college student with a three year old and i am getting married April 7. I have searched for diets but need one i can fit to what i am able to access. My mom used to go to a site that you could pick which foods were best for you. Any help? Thank you.