We have to eat food that is from earth. Simply we have to eat "God-made" foods and not manmade foods like refined flours, sugars and processed foods.
Meals should be balanced with six tastes and it should feed all of our sense organs.
With proper food according to your own body temperament ,the body will be nourished, healthy and energetic and the mind will be calm and pure.
Learn Why it is important to know your body temperament: /body-temperamants