It's good to be in positive energy balance when you're

The correct answer would be, When you are recovering from common illness.

Explanation:

It is good to be in positive energy balance when you are recovering from common illness.

There are two types of energies in a human body. One is positive energy and the other is negative energy. Energy balance is concerned with the activities of the cells in a human body, like what is going in or what is coming out of the cells. When a person is in positive energy balance, more energy is coming in the cells than going out of them. Similarly in negative energy balance, more energy is going out of the cells than coming in them. So when a person is recovering from the minor illness like flu, cold, cough, Positive energy balance plays an important role as it takes in more good energy into the cells than releasing the energy from the body which might be required by the body at the time of recovering from the illness.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .

all the above is what i would say