The cause of bronchitis is not a germ, but the diet.

The chief cause of bronchitis is wrong feeding habits.

The habitual use of refined foods such as white sugar, refined cereals and white-flour products results in the accumulation of morbid matter in the system and collection of toxic waste in the bronchial tube. Another important cause of this disease is smoking. Excessive smoking irritates the bronchial tubes and lowers their resistance so that they become vulnerable to germs breathed in from the atmosphere.

Other causes of bronchitis are living or working in stuffy atmosphere, use of drugs to suppress earlier diseases and hereditary factors. Changes in weather and environment are common factors for the onset of the disease.