Why is nutrition important to health overall?
You are what you eat
This is one very simple answer. What you consume provides the building blocks for all aspects of your cell structure as well as the substrates for you to make energy, detoxify things that can harm you and in general, your body needs fuel as well as supplies to function properly to grow or repair properly as well as defend from exposures in environment.
Ur what you eat, drink, breathe, apply....