fermentation

Fermentation is a process in which microorganisms (like yeast or bacteria) break down sugars in food, usually in warm conditions, to make new substances.

• It is a kind of chemical change caused by living microbes, not just by heat or mixing.
• During fermentation, microbes get energy from sugar. While doing this, they produce useful products like carbon dioxide, acids, and sometimes a little alcohol.
• Yeast fermentation releases carbon dioxide gas, which gets trapped as bubbles in dough. That is why dough becomes soft and fluffy and rises.
• Lactobacillus fermentation turns milk into curd by producing lactic acid. The acid changes the milk proteins, making curd thicker and giving it a sour taste.
• Fermentation works best in warm conditions because microbes grow and act faster; in cold conditions, the process slows down a lot.
• It is also used to improve taste, texture, and shelf life of foods like idli/dosa batter and bhatura dough by making them lighter and easier to digest.

So, fermentation is like letting “helpful microbes” do controlled work on food to create changes we want.