In Sweden the new hype is LowCarbHighFat or LCHF. Often you cant get proper butter in the supermarket, it is sold out. The Swedish Diet Doc says: to believe fat makes you fat is like believing spinach makes you green.
The theory behind, and it seems to work very well in practice, is that carbs stimulates insulin production. Insulin stores energy from carbs as fat and tends to make you peckish soon after a meal. Fat, on the other hand, fills you up and doesn't make insulin, so the energy is used but no excess energy stored as there is no insulin.
It is an accepted treatment for diabetics.
Look at the French, they eat lots of nice cheese and are slim. I love cheese!
Unfortunately carbs seem to hide in many nice things like crisps, rice, chips, whole meal bred etc.
On the other hand it seems impossible to loose weight if not properly medicated, but I'm sure you know all about that.
The DietDocīs English blog: http://www.dietdoctor.com/