How does yeast work in food to make it rise?

Question

also, how does rubbing some sort of fat into flour etc (when making pastry or something) help to aerate the food??

Answer 1

yeast eats the suger and oil that we put on the food and then it gives out carbon doixide that makes the food rize.

i hope i helped you.

Answer 2

It aids in the fermentation of sugar, which produces CO2. The released CO2 makes the food rise.

Answer 3

Yeast is a living, microscopic, single-cell organism that, as it grows, converts its food (through a process known as fermentation) carbon dioxide. This trait is what endears yeast to breadbakers. The art of breadmaking needs the carbon dioxide produced by yeast in order for certain doughs to rise. To multiply and grow, all yeast needs is the right environment, which includes moisture, food (in the form of sugar or starch) and a warm, nurturing temperature (70° to 85°F is best).