Human: I have a friend who is a vegetarian. What is the best diet to follow? Assistant: 
The best diet for your vegetarian friend would be one that includes plenty of fruits, vegetables, whole grains, legumes, nuts and seeds. It should also include lean proteins such as fish, poultry, eggs, beans, lentils and other plant-based proteins. Additionally, it's important to make sure your vegetarian friend gets enough vitamins and minerals by including foods like fortified cereals, nutritional yeast, and dark leafy greens in their diet.