i just need the complete code in prolog: Design an expert system in Prolog to provide recommendations for a personalized diet plan based on an individual's dietary preferences, health conditions, and nutritional requirements.

Implement rules to infer a user's dietary requirements based on their age, gender, weight, height, activity level, and any existing health conditions $($e$.$g$.,$ diabetes, hypertension$).$

Develop rules to suggest an appropriate meal plan considering the user's dietary preferences, nutritional requirements, and health conditions. This should include recommendations for breakfast, lunch, dinner, and snacks, with portion sizes and food combinations taken into account.

Allow the user to input their personal information, dietary preferences, and health conditions. The system should then utilize the knowledge base and rules to generate a personalized diet plan recommendation for the user.

Provide additional features such as the ability to track consumed meals, calculate total calorie intake, suggest alternatives for specific food items, and offer tips for maintaining a healthy lifestyle.

Include error handling and informative messages for cases where the system cannot provide suitable recommendations due to conflicting requirements or insufficient data.