How can someone prevent cardiomyopathy?

Depends: Some forms of cardiomyopathy (cm) are not preventable. These include CM due to genetic conditions, infections and co-morbid conditions like hypertension and diabetes. For people who have these conditions or coronary artery disease modifying risk factors with lifestyle changes, quitting smoking, good control of blood pressure and sugar levels can help. For some, like alcoholic CM simply avoid drink.

Many types: A cardiomyopathy, or weakening of the heart muscle, can be caused by many different factors. These include coronary artery disease / heart attacks, drinking too much alcohol, viral infections of the heart, untreated rapid heart rhythms, genetic causes, cancer chemotherapy and many other factors. Some things cannot be avoided (like genetics). Other factors can be avoided or minimized.