It is great that you are pursuing this route of education. Luckily there is a lot of information online to assist to assist you as well.
There is no denying that we are what we eat. However, our food is lacking essential vitamins/mineral due to mass farming/green harvesting. To add to that there is altered foods due to GMOs etc. It does make it very challenging however it is possible to maintain a healthy diet.
All the best with your quest.