Food can only provide essential energy and nutrients and cannot cure heart failure. However, a scientific diet can assist in controlling heart failure. All heart failure patients should eat a low-fat diet, control their weight and avoid obesity. Heart failure patients with poor cardiac function are recommended to have a low-sodium diet, with a daily sodium intake of less than 3g, and patients with edema should be controlled at less than 2g per day, avoiding pickled foods, canned foods, and fried foods as much as possible. It is recommended to choose easily digestible food and avoid hard and spicy food. Eat less and more frequent meals on a daily basis, and do not overeat. Excessive food intake in a single sitting will increase the burden on the heart and may induce the onset or aggravation of heart failure. Heart failure patients with hyponatremia should have a fluid intake of less than 2L per day. For patients with heart failure and emaciation, supplemental nutrition and moderate exercise are needed. Scientific diet can assist in controlling heart failure, but it does not play a therapeutic role, and patients should seek medical treatment as prescribed by their doctors.