Did I screw myself by expanding and building a second market? When my population hit 70 adults (currently 70/15/15, was higher) I decided to build almost like a second hub on the other side of the river.
I emulated the setup I used initially, to some extent -- market surrounded by houses and crafters, a couple of satellite product facilities (built the same way my main town was built), but since then I've had starvation problems and had problems maintaining a food reserve (though things are starting to improve a bit now that I got through a season of farming) and I've had about 12 people die of starvation this year (and in an odd twist of fate they were almost all gatherers/farmers).
Food consumption looks to be up a bit (despite no pop change), but production should be too since I added more sources (it is not and my reserves are trending downwards). I can't account for the increased consumption, or where resources went, but almost every barn is empty, the vendors never have food on them when I check, and both marketplaces are often empty. My ale/alcohol production is at the same level it was previously, so it's not like I've suddenly fed MOAR BERRIES into it. Sometimes I'll inspect people and they'll be nowhere near their home or workplace, and the pathing for NPCs and homes seems to have suddenly gone tits-up (and I'm not sure if there's a good way to reset that aside from perhaps unassigning everyone and re-assigning them and hoping they get a job near their home -- is there a good way to do this?).
I'm just trying to figure out what caused it to all go belly up when a season prior I was sitting on a surplus of every non-building resource and it's got me perplexed.
Edit: Or it might have just been the AI being silly. A year later I've got a stockpile of 800 food, but I watched a starving NPC walk all the way from one side of the map (the one with his home, work, market, and nearest storage barn) to the other to get something to eat, only to have someone empty that barn before he got there, then watched him walk almost all of the way back -- walking past a stocked barn and both marketplaces -- trying to get... who knows where... before dying of starvation.