It's only Hearty Groddle Sammiches that give you the warm feeling that protects you in the very cold places. Not every food item that has the word 'hearty' in the title. I've checked with staff type folks and tested this.
It's come up a few times in global chat and helpful people helpfully tell inquiring folks that it's not just the sammiches but I've checked and it really IS JUST THE SAMMICH. Other helpful people point out that it's really a matter of having enough food which is also true, but not the answer to the actual question.