With humans needing over 100 different nutrients, it is impossible to get any optimum food or diet to get all the nutrients that you need. On the other hand, people have been living on Earth for 50,000 years. That means nature has put in a mechanism for each one of us to obtain needed nutrients. This mechanism starts with the sensation of hunger.
A certain type of nutrition seems to be the key factor in keeping people free from lifestyle diseases while another type of nutrition contributes to ensuring that large numbers of people develop lifestyle diseases. Why?