Viruses, Allergies and the Immune System

Why are problems such as viruses, allergies and post-viral syndrome increasingly prevalent today? Is it true that a simple allergy might develop into a serious degenerative disease? What part does the immune system play in these processes - and how can it be affected by lifestyle?Jan de Vries places a strong emphasis on the importance of diet, and the effects of food additives and drugs. Did you k...