Carbohydrate counting is an effective meal planning method that was used in the Diabetes Control and Complications Trial. It involves assessing a patient's needs, developing an optimal carbohydrate intake pattern based on lifestyle and schedule, and teaching patients how to achieve euglycemia through various carbohydrate intake patterns. Summarizing key points from the document, carbohydrate counting decreases A1C by 1-2% in people with diabetes, achieves and maintains target blood glucose and lipid levels, and prevents or slows chronic diabetes complications by modifying nutrient intake and lifestyle.