Review Question - QID 212499

A 39-year-old man presents to a primary care clinic for a routine physical exam. He denies any complaints. He has a long beard and hair, wears several copper bracelets, and a crystal amulet. When asked about his diet, he discloses eating mostly canned foods, which he has stockpiled in his cabin in case there is a natural disaster or "apocalypse" (though he admits that this is highly unlikely). He has a few close friends, but feels awkward when meeting new people. He seems happy overall and has many long-standing interests, including hiking and astrology. He has been steadily employed as a data scientist and a paranormal investigator. He has never been diagnosed with a mental illness, though he has a family history of schizophrenia. Review of systems is negative for depressed mood, anxiety, or hallucinations. Thought process is linear and reality testing is intact. Which of the following is the most likely diagnosis for this patient?