Olestra is a synthetic fat substitute that has gained notoriety for its ability to reduce calorie intake and help with weight loss. However, it has also been criticized for its side effects, such as causing gastrointestinal problems. There are several synonyms for the word olestra that can be used to explain what it is, including sucrose polyester, Olean, and calorie-free fat. While olestra is a word that has become well-known in the world of health and wellness, these synonyms provide alternative ways of referring to this ingredient, making it easier for people to understand what it is and how it works.