Diane - I am not a great authority on this, but I will offer up my experiences.
I too have had a goal to drop weight. I am working out far more than ever before, but I still find that if I let my diet slip, the pounds come back on.
Last week 5 lbs. So I believe the word is discipline, maintaining the exercise level while following whatever diet you are using.
I am sure there are differences in diets, but losing weight seems to come down to two things Calories Consumed and Calories Burned in a day. What ever mean you use to control it will be fine as long as you are consistent.
Best of luck to you, keep us posted...
JC1.5