Question

how can you say heating and boiling is a method of prevention of food​

Answer 1

by eating the food we prevent the food from microorganism that are present in it

Answer 2

In the case of pasta, churning, boiling water keeps the food in motion, prevents sticking, and cooks quickly so the pasta doesn't get soggy. Green vegetables are tossed into boiling water to cook as quickly as possible so they retain their flavor and bright color in a process called blanching; if they were to simmer gently in a covered pot, their color would dull, and they would lose much of their texture. Boiling causes speedy evaporation, a useful effect for reducing sauces, where the volume of the liquid decreases and flavors are concentrated.

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