Having a healthy Diet never causes eczema. Food may causes allergies, but it will not cause eczema. It is usually the genes of a person that will cause eczema. If you are allergic to certain foods then you should really try avoiding them, because they can trigger your eczema breakouts. Dairy products such as eggs, nuts, preservatives and citrus fruits are more likely to trigger eczema. So be sure to stay away from whatever is triggering your eczema breakouts and you can figure out what is cuasing them and ultimately prevent them.