EPG stands for esterified propoxylated glycerol, a fat substitute designed to look, taste, and cook like regular fat while passing through your body largely undigested. Because your body can’t break it down the way it breaks down normal fats, EPG delivers a fraction of the calories. It’s showing up in products like chips, baked snacks, confections, and frozen desserts as manufacturers look for ways to cut fat calories without sacrificing texture or flavor.
How EPG Works in Your Body
Regular dietary fat is made of triglycerides: a glycerol backbone with three fatty acid chains attached. When you eat them, an enzyme called lipase clips those fatty acids off so your intestines can absorb them. EPG has a similar structure, but with a critical modification. Small chemical units are inserted onto the glycerol backbone, and these units have a bulky side group that physically blocks lipase from reaching the bonds it normally cuts. Think of it like putting a shield around the lock that lipase needs to pick.
Because lipase can’t do its job, EPG passes through your digestive tract mostly intact. It is not absorbed or metabolized to any significant degree. That means the calories from EPG don’t count the way calories from regular cooking oil or butter do.
How EPG Is Made
EPG production starts with ordinary fats and oils, which are split into their two basic components: glycerol and fatty acids. The glycerol is then reacted with propylene oxide, which attaches those protective side groups to the molecule. Finally, the modified glycerol is recombined with the fatty acids. The end result is a substance that closely resembles a triglyceride in structure and appearance but resists digestion.
Because the starting materials are standard fats and oils (often plant-based), EPG can be tailored to mimic different types of cooking fat. The finished product behaves like conventional fat in recipes, which is why it works in fried snacks, baked goods, and creamy frozen desserts without requiring manufacturers to completely reformulate their products.
Where You’ll Find It
EPG is marketed commercially by a company called Epogee, which supplies it to food manufacturers. It’s currently used across several product categories: baked and salty snacks (including chips), confections like chocolate and coatings, and frozen desserts. Brands using EPG typically promote reduced fat or reduced calorie claims on their packaging, so checking the ingredient list or nutrition label is the easiest way to spot it.
Regulatory Status
EPG has been submitted to the FDA under the GRAS (Generally Recognized as Safe) notification process, which is the standard pathway for food ingredients that manufacturers consider safe based on published scientific evidence. Safety evaluations in both animal studies and human trials have supported its use. Regulatory reviews have found low potential for biologically meaningful effects at the consumption levels people would typically encounter in food.
Digestive Side Effects
Because EPG passes through undigested, it can cause gastrointestinal symptoms, particularly at higher intakes. An eight-week human study found that people consuming 25 or 40 grams per day reported more frequent issues: gas with discharge, oily spotting, oily or liquid stools, diarrhea, and soft stools. The severity and frequency of these symptoms scaled directly with how much EPG people ate.
At 10 grams per day, EPG was reasonably well tolerated. For context, 10 grams is roughly the amount of fat in a small handful of potato chips, so moderate snacking is unlikely to cause problems for most people. The issues at higher doses are similar to what happened with olestra (the fat substitute used in certain chips in the 1990s), though EPG’s molecular design is different.
The side effects likely happen because undigested EPG acts as a “lipid sink” during its transit through the gut, meaning it can pull along other oily substances and water, loosening stool in the process.
Effect on Vitamin Absorption
One concern with any undigestible fat is whether it drags fat-soluble vitamins (A, D, E, and K) out of the body before they can be absorbed. The same eight-week study that tracked digestive symptoms also monitored vitamin levels in participants. Researchers found low potential for meaningful interactions with fat-soluble and other nutrients in the gastrointestinal tract at expected consumption levels. In other words, normal dietary amounts of EPG don’t appear to create vitamin deficiencies, though eating very large quantities could theoretically interfere with absorption, much like the lipid sink effect behind its digestive side effects.
How EPG Compares to Regular Fat
From a cooking and eating standpoint, EPG is designed to be a near-seamless swap. It mimics the mouthfeel, texture, and functional properties of conventional fat in food manufacturing. For you as a consumer, the main difference is on the nutrition label: fewer fat calories per serving.
The tradeoff is straightforward. You get a lower-calorie version of a product that would normally be high in fat, but if you eat a lot of it in one sitting, you may experience the oily digestive symptoms described above. Keeping portions moderate, roughly what you’d eat in a normal snack serving, keeps most people in the well-tolerated range.