Pneumonia can be caused by a number of factors and during its onset patients should try to avoid a diet that is highly irritating and high in fat. Foods that are highly irritating include ginger, fennel, garlic, onions, etc. Diets high in fat include fatty meats, beef brisket, walnuts, almonds, etc. Patients should also be advised to avoid smoking and alcohol abuse, and not to overeat. It is important to note that diet is only one part of the treatment and the severity of the disease varies from patient to patient, so it is advisable to seek medical advice if you are unwell. Your doctor will be able to advise you on the appropriate treatment plan for your particular case and give you sound dietary advice.