Before a pet scan, breakfast should prioritize nutrient-rich foods like oatmeal, baked chicken, fish, bananas, and apples while avoiding sugary treats, artificial sweeteners, whole grains, processed foods, and red meat. Sticking to this diet optimizes energy levels, reduces inflammation, and improves digestion. Overcoming challenges involves meal planning and recipe ideas to ensure satisfaction. Long-term benefits include reducing disease risk and enhancing well-being.