Fans of fast food have to be careful as it contains unhealthy amounts of salt. For example, a survey of thousands of owners of 11 different fast food chains revealed that their food contained about more than 1,700 milligrams (mg) of sodium. Clinical guidelines in the United States should not eat more than 1,500 mg of sodium per day. "The sodium was high in all food chains we studied, in particular, the density of sodium," said Christine M. Johnson, the Program for Prevention and Control of Cardiovascular Diseases, Department of Health and Mental Hygiene ...