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The document discusses how designers can use "persuasive design" or "nudging" to subtly influence people's behaviors, decisions, attitudes, and emotions. It notes that much of human decision-making is driven by unconscious cognitive biases and emotions. The document proposes using nudging techniques like signage and food station layouts in college cafeterias to encourage students to make healthier food choices. The goal is to help students maintain a positive mental state, manage their weight, reduce health risks, and make environmentally-friendly decisions.