Have you looked in your refrigerator lately? How long has that head of lettuce been in there? What about those leftovers from three days ago? Refrigeration does slow down the deterioration of food, but it certainly does not stop it. As every day goes by, whatever is in your refrigerator is losing its nutritional value.
Some people will eat something out of the refrigerator that is three weeks old, or something from the pantry that is a year old. By this time, some vital nutrients have been completely lost.