I wonder if this really works long term, how people's leptin resistance confounds its efficacy, etc. I still remained shocked at how effective carb restriction

I wonder if this really works long term, how people's leptin resistance confounds its efficacy, etc. I still remained shocked at how effective carb restriction is, assuming you swap in lots of protein and fat from non-processsed food sources. The hassle is that it takes more time to construct meals, etc., but if you eat less than 40g of carbs a day, you can eat to satiety and lose weight with relative ease (at least, I did, as did many other people I know, so sample size of n=~8, obviously, not conclusive).