I'm not sure what your instructor is asking for, but I work in an community OP mental health center in NC, and many of our patients do not eat very nutritious meals because they have very limited incomes. Some of our patients with chronic Schizophrenia (and even those with other diagnoses) lack skills needed to choose the right foods at the store and end up buying frozen pizzas or prepackaged foods that they can microwave, because they don't know how to cook either. They don't eat alot of fresh fruits or vegetables, and choose foods like crackers, Spam, potted meat, and vienna sausages. Soft drinks are cheaper than juice, so that's what they buy. AND many of their medications cause weight gain, and most will develop diabetes if they do not already have it. Plus, they get high cholesterol, and all the other disorders that come from obesity. So, patients need education as to proper diet, how to buy the right foods at the store, and how to plan and prepare meals.
Sometimes a person who is very depressed lacks energy or motivation to prepare nutritious meals, and I've seen Bipolar patients who can't focus or concentrate long enough to eat nutritious meals if they remember to eat at all. Sometimes, finger foods or foods they can eat "on the run" are appropriate as long as they are healthy. Most psych meds also cause constipation, so there is another problem. They need education to teach them to increase water intake, and to drink less tea or soft drinks, as well as adding high fiber foods to their diet. Nutrition is a big issue for psych patients. I don't know of any alternative therapies, they need good basic nutritional therapy.