I've heard that some foods are labeled as "trans fat-free" may actually contain harmful trans fats.  Is this true?  [electronic resource] 

 -  Mayo Clinic health letter (English ed.)  Aug 2014 
 - 8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0741-6245 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Food Labeling--standards<br/>Humans<br/>Trans Fatty Acids