Mono and Diglycerides
Monoglycerides and diglycerides are food additives commonly used to combine ingredients containing fats with those containing water, two types of ingredients that don't ordinarily combine well. Food manufacturers typically use them to extend a product's shelf life. Made in part of fatty acids, they are similar to triglycerides, the predominant fat in food according to the Harvard School of Public Health, except they are classified as emulsifiers rather than lipids.
According to registered dietitian Mary Beth Sodus of the University of Maryland Medial Center, trans fats have been associated with increased risk of numerous diseases, including heart disease, stroke and diabetes. They promote inflammation and obesity; raise LDL, or bad, cholesterol levels; and lower HDL, or good, cholesterol levels. Made up in part of fatty acids, mono- and diglycerides may contain trans fats, either when manufactured in a lab or, if they come from an animal or vegetable source, when exposed to heat for processing into packaged and prepared foods.
n 2006, the U.S. Food and Drug Administration began requiring that all food manufacturers list a food's trans fat content on the label. This law applies to lipids, like triglycerides, but not to emulsifiers like mono- and diglycerides. Therefore, even though mono- and diglycerides may contain trans-fatty acids, they do not fall under these labeling requirements. This means a food may be labeled as possessing "0% trans fat" yet still contain trans-fatty acids from mono- and diglycerides.