Weight loss depends on calories out exceeding calorie in. To determine calories out, calculate your Basal Metabolic Rate. Fat2FitRadio.com/bmr will calculate your current BMR that you should never go below, and the the calorie level you should be consuming based on your goal weight.
The goal is to eat at your goal calorie range for life. This isn't a quick fix diet plan. It's a plan that you'll live with for the rest of your life.