I know different people can be different, but keeping your fat intake up is an absolute essential in losing this weight, along with keeping calorie intake up. At my weight and activity level I usually eat from 1500-1700 calories a day with 65-70% fat, 4-5% carbs and the remainder protein. So far this has worked very well for me.

When you set up your FitDay account, click on 'Activities'. You'll find in there what your basal metabolism point is in addition to calories burned for your lifestyle. You can also add all of your activities and see how they affect your overall caloric burn. I was really surprised to see just how many calories I can burn even with a sort of inactive lifestyle (as in I don't work out).