Read the following context and answer the question.
Context: These include nonfat dairy products or processed foods . Finally , there are foods that you should absolutely avoid . These include meat , margarine or other oil products , avocadoes , nuts , dairy products , olives , sugar and alcohol . You should also avoid products that are commercially prepared .
Question: Why should the recipient avoid commercially prepared products ?
Answer:


They tend to have a myriad of chemicals .