Quick preface, I love the game and hope I'm not being too harsh, I really appreciate all the hard work the devs do!
But...
I really don't see the beneficial impact of provisions. From what I've read, it takes longer than week to starve to death, and I can accept that maybe not eating for a day might make you weak, I can't accept that it would make you unfit for battle.
Therefore, when a soldier is wounded for lack of food that he previously had the day before, I need to abstract it in my mind and say... "He had some illness... that because he didn't eat... flared up...?" It really shows the mechanics of the game taking a hard line.
Also, how long do armies typically stay in the field away from their power bases (In BM not in real life)? A week? Two? Not long enough for very many to starve (realistically, not in BM). And there is already morale penalties for being abroad, equipment damage and bonds to cash to prevent armies from stomping and camping wherever they please for too long.
I think this is a mechanic that adds nothing to game play but frustration. I don't think soldiers should consume food. Especially when 8113 peasants can survive on 17 bushels of food per day. That means to feed one man it costs .002 bushels of food. Lets say the average unit is 50men, that's .1 bushels. Lets say the average army is 1000men, that's 2 bushels of food to feed a whole army, per day. One week, 14 bushels. It's pretty insignificant, especially when provisions would only be used when in provinces that don't produce surpluses.
I understand the feature isn't finished, but I wanted to share my concerns.