Hundreds of pages to go through and they leave the reader more confused. My way is very simple. Old food items, which have been cooked or lying in the refrigerator for more than 72 hours. Food which is very old, nourishes the emotional blocks from the Past and is extremely detriment towards spiritual progress. Our connection with the Earth is through food.
Earth is a store house of all kinds of energies.
The food we eat helps us tap the negative or positive forces from the Earth. If you are happy, you must be eating healthy. If you are Sad and lifeless change the foods you eat and the way you eat. The choice is yours.