Whilst your freezer is the ideal solution for storing most foods in top condition, there are some foods recommended not to be frozen at all. These are:
Salad vegetables with a high water content such as cucumber, tomatoes, celery and lettuce. They will become limp on thawing so can't be eaten raw, but can be frozen if added with other ingredients for soups or casseroles
Carbonated drinks - they may explode if stored at low freezer temperatures!
Eggs can't be frozen in their shells, as the egg will expand and break the shell. (Tip: they can be frozen if the egg/eggs are slightly whisked or if the egg yolk and egg white are separated. For example, freeze yolk in ice cube trays for later use)
Mayonnaise and yoghurt. Both of these will separate upon thawing
Cream containing less than 40% butterfat will also separate upon thawing, but can be frozen if it is combined with other ingredients. Similarly, cottage and other curd cheeses should not be frozen alone but if mixed in with other ingredients will freeze successfully
Icing - if frozen it will crack and/or crumble when thawed
