This paper seems to say that the metabolic benefits of a low carb diet are not caused by any weightloss associated with such a way of eating but independent of it.

I apologise if this has already been posted elsewhere.

The research team, led by research scientist Parker Hyde, ensured that the participants would not lose weight by providing them with pre-prepared meals that contained an amount of calories equal to their energy expenditure.
This gave me some pause for thought, because I am not convinced that you can prevent the "guinea pigs" from losing weight by providing them with prepared meals that contain a calorie load equal to their calorie expenditure. If you come from the Zoe Harcombe school of thought you may well believe that calories are not an important measure in determining weightloss.