If bad smelling breath has become a cause of serious concern for you, you can gradually increase the consumption of foods that contain carbohydrates. This might help in bringing the level of ketones down and help in lowering the pH levels of the blood. Also, it would be best to determine the halitosis is caused due to other problems such as dental decay, gum diseases, formation of plaque, tonsil stones, throat infections, diabetes mellitus, gastrointestinal problems, sinusitis, anemia, etc.