What Diet Should Be Followed If Suffering With Hyperkalaemia?

Hi there. I work as a nutritional therapist. I m preparing a model Meal Planner for a client. I want to recommend a diet that is rich in natural (health promoting), foods, including lots of vegetables, pulses as well as meat and fish. My client requires a low potassium diet. She s on immunosuppressant medication after receiving a liver transplant, and developed hyperkalemia as a side effect of the medication. Are you aware of any written materials that specifically cover this matter that you could refer me to? any assistance would be greatly appreciated.