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CLINICAL CASE SCENARIO 1: Mr. Khan, a 68-year-old retired teacher in Quetta, is admitted with pneumonia. He is weak, has a poor appetite, and his room is dark and poorly ventilated. His family brings him oily, spicy food from home, which he barely eats. The nurse ensures his room is clean and well-lit, opens the window for fresh air, and provides him with simple, warm soup and bread. The nurse's actions are a direct application of which theory?