Gridlock

At the end of the day every diet works by reducing calories, keto diets work because you lose the calories from the carbohydrates and in diets like atkins you their are certain mechanisms that reduce your hunger/cravings. If you count the calories on an "eat all you like" diet you will find that you are eating less an that is why you are losing weight.

Mens fitness magazine did and interesting article recently where to prove the above point they made a diet where you can eat as much as you like of any food that begins with an M or an F but nothing else. the people doing it automatically cut their calorie intake to about 1350cals a day just because they were restricted in their choices.

I think the key thing with a diet is that It is comfortable enough to stick with (there is no point in following a really strict diet if it makes you ill or deprives you so much that you crack on the fourth day and have a curry blow out!)

Also I tend to cycle different diets doing each for 1-2 months then trying a different one - this not only stops me from getting bored but also you can shock the body by constantly shaking things up - after too long on any diet your body gets used to it and it stops working well.