Question

why a piece of bread taste sweet when chewed for sometime​

Answer 1

It breaks down starch in bread into simpler sugars (maltose) which give a sweet taste, since you are chewing for a longer while, more time and more mixing, for enzymatic action and hence you perceive it as sweet.

Answer 2

Answer:

Bread is an excellent source of proteins, vitamins, minerals, fibre and complex carbohydrates.

Explanation:

The digestion of the food starts as soon as we put food in our mouth. Our teeth cut the food into small pieces and the salivary glands secrete saliva that mixes with these food materials.