Breaking stalls by cutting protein consumption is the wrong way to go. It might actually break a stall but not for the reason that might be thought.
A Thought Experiment
If you eat 50 grams extra of protein in a day it’s only 200 calories. Overeating protein doesn’t lead to weight gain (Too Much Protein?). It’s the additional fat that comes along with particular proteins that do that.
Try eating 200g of lean protein a day like the carnivore guys do. You won’t stall on 800 calories with 200g of lean protein. You will preserve lean body mass and lose a lot of weight. I am not advocating doing that just making the point that it’s not protein causing anyone to stall – it’s the fat that comes along with fatty meats.
In fact, that’s not all that much different than the Protein Sparing Modified Fast diets.