It could be the meals making you cold, but you have to be careful not to overdo it on salt. Overall, sodium should be consumed preferentially over potassium, but you should never eat more salt at a time than what tastes good to you.
Also, sodium in itself doesn't seem to shut down the stress response, but when it is coupled with starch, sugar, protein, and some fat, it does its job. Try not to view salt as an isolated variable, but rather one factor among many that you should be focusing on simultaneously. When all the variables are dialed in just right, including the salt, then things start to work. If you just focus on the salt and try to consciously eat more of it all the time, you can actually create a stress response rather than shutting one off.