An inventory system for a refrigerator appliance includes an inventory plate which is operably coupled to a load cell and positioned within a chilled chamber. The inventory plate may be a fixed shelf or a portable coaster on which food items may be placed. A controller is configured for monitoring a weight of the food items over time using the load cell and/or a moisture content using a moisture sensor and providing an indication of food quality based at least in part on the weight and/or moisture content of the food items.