I'm not too sure if this will help, but I am on a 1200 calorie a day diet. And it has worked for me as I have gone from 180lbs to 140lbs. And pretty much has kept it off for about 4 years now. I try to stay in the range of:
Breakfast - 250 calories (8am)
Snack - 130 calories (10am)
Lunch - 250 calories (12:30pm)
Snack - 130 calories (3pm)
Supper - 300 calories (6pm)
Snack - 130 calories (8:30pm)
I also try to keep my carbs in the 75 gram range and veggies are free except for the ones high in carbs (carrots and green beans are a wonderful tool to have! I am a bored eater, and carrots, cucumber, celery and green peas are a perfect, mindless snack)... I hope this helps