Can be useful to treat disorders such as phobias, obsessive-compulsive disorder, and anxiety disorders by pairing a stimulus that normally causes an unwanted response with a neutral one, eventually creating desirable involuntary reactions.

Depends on which disease, but as a general rule eat healthy. many vegetables.                                                        hope my answer has come to your . you for posting your question here in we hope to answer more of your questions and inquiries soon. have a nice day ahead! : )     (p.s mark as brainliest if )