Food is one of the most crucial Resources to manage, it is required to feed your Clan and ensure your Clan doesn't Starve and thus become Sick, therefore your Food production i.e. Food Sources, must outweigh your Clans Food Consumption.
It is important to stock up on Food before Winter starts as Food production is reduced, this production debuff can be reduced by 30% with Freya's Blessing. It is especially important to stock up before Blizzards as these will reduce your Food production even further.
Your Clan starts with a maximum Food storage of 500, this can be increased with the use of Food Silos. each Food Silo increases maximum Food storage by 500