I didn't always kept track of food level but when i did, i was always 300+ in food product and going up. I've just play a new game to try if food was the problem and after day 4, it'd reset itself again and i had over 1k in food product with only 48 people. I don't understand :'( ahah I just saw, this time ressources have reset to 0, but the game still continue (no Game Over screen this time), but when i open the Worker screen, it'll indicate no building available.