I have 3 sisters, myself and one sister are overweight my parents are both overweight. The sister who is thin eats whatever she wants but in very reasonable portions. So if she wants McDonalds she has a kids meal and is full afterwards.
My other sister is all about the drop all wheat from your diet to lose weight and then she binges and puts it back on.
I am trying to do portion control so the loss is way slower but, hopefully I will learn better behaviours. Other heavy sister and I go around and around battling about which way is better. I say look at the lifelong thin sister. She knows when to stop eating. I did Dukan a few years ago and lost a whack of weight which I have since regained. I don't think I can do the extremely low carb diets and see any longterm success.