Able has always stressed in whatever post I read regarding the importance of calorie intake.
Changing your diet completely is extremely daunting and learning how to cook/incorporate 90 percent new foods into your life is hard as hell. So in the beginning, I just picked the easiest things to eat and ate them all the time. That is the wrong thing to do. You need a variety. Just eating salads everyday is not going to cut it and of course you will lose a ton of weight.
The complexity of changing your diet and learning how to still keep your calorie intake at a normal level has nothing to do with the diet.