Hygroscopic (moisture-drawing) foods interact with ambient humidity... They either absorb water vapor from their environment or give off water vapor.
This happens until they are in a state of equilibrium with their environment. The right humidification of the air in the cold store is therefore almost as important as correct cooling.
Lean beef contains up to 75% water and, without air humidification, will quickly lose weight and therefore its sale value. In addition, meat will only keep its taste, color, and appetizing look on display at the right humidity.