My elderly father is experiencing confusion, tremors, hallucinations, sometimes doesn't even know the date, and sometimes doesn't recognize people close to him like his brother. He has had an MRI and various blood tests, which turned up nothing. Seeking a second opinion, a doctor that examined him recently suggested that his condition might be a result of poor diet even though he has no signs of malnutrition. And he also recently lost his elderly mother. Just wondering if grief and poor diet would cause the above mentioned symptoms