Does anyone know what foods someone can eat if they have gout?

My grandma has gout. She is 89 years old and she also has diabetes, high blood pressure and is lactose intolerant. I need some advice on what foods she can eat and what foods she shouldn't eat. I've asked different doctors and they give me a short list of chicken and bread, and that she shouldn't have red meat or asparagus. I need a more detailed list if anyone can help me I would greatly appreciate it. Thanks