How do I help resistant and complex patients who won't follow a diet plan?

You can build a good plan for most people. The ones who defeat you are the resistant, who will not follow it, and the complex, whose bodies and lives do not fit the textbook. That is the hardest part of your work, and struggling with it means you have the basics well in hand. What is left is the human part, which is always the hardest. With resistant patients, the plan is rarely the problem; the person's readiness is. You cannot force change into someone, and pushing harder often pushes them further away. Instead of prescribing, get curious. Ask what would actually fit their life, what they are willing to try, what is really in the way. A small plan they will follow beats a perfect one they will not. Meet them where they are, not where the ideal says they should be. With your next difficult patient, spend more time listening than planning. Ask one real question about their life and let the plan follow their answer. The complex cases soften when you stop treating a chart and start working with a person. You are not being defeated. You are meeting the limit of plans and the beginning of partnership, which is where this work gets real.