There was some research that showed that the brain goes into hunting mode _for protein_, and it gets satiated when enough protein is had. But, today's sugary f

There was some research that showed that the brain goes into hunting mode _for protein_, and it gets satiated when enough protein is had. But, today's sugary foods contain less protein than before, so we keep eating these foods until the quota of protein has been met. This is why probably the keto diet reduces appetite.