More than 3,600 chemicals used in food packaging or preparation have been detected in human bodies, some of which are hazardous to health, while little is known about others, a study said Tuesday. More than 3,600 chemicals used in food packaging or preparation have been detected in human bodies, some of which are hazardous to health, while little is known about others, a study said Tuesday. Environment Phys.org – latest science and technology news stories