Different methods of food preservation are-

1. Drying or dehydration where water is removed from food stuff preventing the growth of microbes. Examples- vegetables, dry fruits, pulses, spices etc.

2. Preservatives- Sodium benzoate, sodium metabisulphite etc. are used as preservatives to store pickles, jam, squashes etc.

3. Salting- Adding of common salt helps to preserve meat, fish, tamarind, raw mango etc.

4. Using sugar- sugar is added to jam, jellies, squashes.

5. Using oil and vinegar- pickles are mainly preserved by these constituents.

6. Pasteurization- it is used to preserve wine, milk etc.

7. Irradiation- High energy gamma rays or X-rays are used to preserve foods.

8. Vacuum drying- Milk is converted into milk powder by this process where moisture is removed.

9. Proper storage and packing- dry fruits, vegetables are properly stored and sealed in air-tight packets.

10. Hot and cold treatment- We can boil food and store or we can refrigerate foods at very low temperature. Because microbes die at very high or low temperature.