The level of free fatty acids is not diagnostic in humans, but it is significant after clinical scientific research. An increase in free fatty acids in the human body will lead to an increase in the body’s resistance to insulin, and an increase in fatty acids in the human body may lead to diabetes. Increased free fatty acids have a certain impact on the chances of acquiring cardiovascular diseases, so the human body in the case of increased free fatty acids will have a higher chance of heart disease. Increased free fatty acids can also cause metabolic diseases, such as bone metabolism or fat metabolism, which are harmful to the human body. To avoid high levels of free fatty acids, dietary control, low-salt, low-fat diets, and appropriate intake of refined proteins can help to promote the reduction of free fatty acids in the human body.