Before the advent of widespread refrigeration, people used various methods to preserve food. Salting and smoking were common techniques for meat and fish, removing moisture to prevent spoilage. Pickling vegetables in vinegar or brine was another popular method. In colder climates, people would store food in ice houses or even bury it in the snow. These methods were essential for survival, especially during long winters when fresh food was scarce. What was the primary challenge that led to the development of these food preservation methods in the past?
A) The desire for more varied diets.