Question

after we work hard we feel hungry, explain

Answer 1

it is just because when we do our work hardly or do hard work or energy is lost and that's why we feel hungry as the energy in form of food is consumed.

Answer 2

When we work out or work hard then our body use the energy that is stored up in our system.

Hence, it will utilise the energy slowly but eventually.

Once the energy is on the verge of ending we started to feel hungry.

It is a mechanism so that we can eat and get the required nutrient in our system. This energy will be the used later on.