Our earliest nutritionist was our nose and tongue. When we smelled foods that were needed, we would salivate. We would also find the food to be delicious. After we had enough, the taste of the food would change. Sometimes the difference is in just one bite.
Therefore, we have to eat natural foods that are without artificial ingredients or without food processing, in order to recover our natural abilities of smelling and tasting. We may not reinstate our abilities overnight, but improvement will definitely be achieved after some times.