Scientific way of understanding your diet. Try to know that how much quantity of protein, vitamin, minerals, water, sugar you should take in a single day.
Why Do We Need To Study Health?
I would say so you have a basic understanding of how the human body works and what illnesses can do to it.
Because it's important to know what we eat and do everyday in order to prevent the illness, and we need to know what's the harm to our health as well.