The Mystery of Food - Traditional Indian Food Preservation

Food Spoilage: Food gets spoiled when microorganisms like bacteria and fungi (molds) grow on it. These microbes need moisture, air, and warmth to thrive, usually between $25^{\circ} C$ and $40^{\circ} C$.

Dehydration (Sun-drying): This is a traditional method where food items like mangoes (to make $Mamidi \ Tandra$), papads, and chillies are dried in the sun to remove moisture, which prevents the growth of microbes.

Pickling: A method where salt and oil are added to vegetables or fruits. Salt acts as a preservative by drawing out water from the food and the microbes through osmosis.

Sweetening: Making $Murabba$ or jams involves cooking fruit in a thick sugar syrup. The high concentration of sugar prevents spoilage.

Boiling and Cooling: Boiling milk kills harmful bacteria at high temperatures ($100^{\circ} C$), while keeping food in a refrigerator at low temperatures (around $4^{\circ} C$) slows down the growth of germs.

Shelf Life: The period for which food remains fit for consumption. Preservation techniques aim to increase this shelf life.