There are some good sports nutritian books by Nancy Clark and Liz Applegate that have good information on losing weight at a sensible pace. The big bit of advice they both have is that even when losing weight you need to eat more than you might think from other diets you might have been on.
I'll check at home over the weekend when I can look at my books - but I think a rough rule of thumb is your basal metabolic activity needs 10 X your weight in pounds then around 40 - 60% of that for daily activity depending on your lifestyle and then whatever you use in purposefull exercise.
So assuming your lifesytle is moderately active your 'normal' needs at 160 pounds are 1600 calories for basal metabolic rate + 800 for daily activing = 2400 before taking account of your exercise.
Then they both recommend cutting out about 500 calories a day.
If I have remembered the figures right even trying to lose weight you should be closer to 2000 calories a day than 1400