Fatty acids are a class of compounds composed of carbon, hydrogen, and oxygen, and are the main components of neutral fats, phospholipids, and glycolipids. Free fatty acids (FFA) are a type of organic acid. Lipids present in the human body can be broadly classified into three types: cholesterol, neutral fats (triglycerides), and phospholipids. Free fatty acids are one of the substances produced by the breakdown of neutral fats.