He's had malaria, bilharzia (a tropical disease caused by parasitic worms picked up from snails), leishmaniasis (a parasitic disease spread by the bite of a sandfly), roundworm, botflies and ringworm.
Some things, however, are virtually unrecognizable once they've been frozen and thawed. In other words, you can freeze whatever you want, and use these foods frozen, but some foods don't hold up after being defrosted. Here are 11 things you should not keep in the freezer. Freezing food is a delicate matter. No matter what you're freezing, make sure to use it within nine months or so (yes, that means cleaning out your freezer), and also make sure to defrost it correctly.
Freeze-Drying. Freeze-drying is a special form of drying that removes all moisture and tends to have less of an effect on a food's taste than normal dehydration does. In freeze-drying, food is frozen and placed in a strong vacuum. The water in the food then sublimates -- that is, it turns straight from ice into vapor. Freeze-drying is most commonly used to make instant coffee, but also works extremely well on fruits such as apples. You probably don't have a good vacuum chamber at home, but you almost certainly have a refrigerator. If you don't mind waiting a week, you can experiment with freeze-drying at home using your freezer.