For Chinese people, cooking is inseparable from oil, whether it is vegetable oil or animal oil. So how to have a healthier and more reasonable meal? I believe we are all particularly concerned about it! First, can cholesterol be consumed freely? The latest Dietary Guidelines for Americans has removed the standard recommendation of 300 mg of daily cholesterol intake, and the Dietary Guidelines Advisory Committee (DGAC) believes that food intake of cholesterol is no longer a concern. The reason: Although foods high in cholesterol such as egg yolks and animal offal have long been considered to be a factor in raising the risk of cardiovascular disease, scientific studies over the years have not found a clear causal relationship between the two. Due to the lack of clear scientific evidence and the fact that the body tends to produce much more cholesterol than is contained in the diet, the DGAC has finally decided not to consider cholesterol as a “nutrient of concern for overconsumption”. Does that mean we can eat whatever we want? The internet was flooded with criticism and accusations. What are “the wrongful case of cholesterol”, “the bloodstained history of cholesterol”, “the big lie of cholesterol”, “to defend the name of cholesterol, egg yolk Eat what you want to eat”, “38 years of injustice! Cholesterol in the blood vessels is not really eaten out” are all there. Second, we must first look at what is fat, blood lipids, triglycerides, cholesterol? 1, fat Fat is an essential nutrient for the human body. The broad sense of fat includes neutral fat and lipid, and the narrow sense of fat only refers to neutral fat. Neutral fat is an ester composed of – one molecule of glycerol and three molecules of fatty acids, called triglycerides. Lipids are substances that are soluble in fats or fat solvents, such as phospholipids and sterols. 2, blood lipids Blood lipids are widely present in the human body. They are essential substances for the basic metabolism of living cells. Generally speaking, the main components of blood lipids are triglycerides and cholesterol. 3.Triglycerides Triglycerides are the fat component of the human body. If we take pork or beef as an example, then triglycerides are the white fatty parts. Subcutaneous fat is the accumulation of triglycerides. Triglycerides are involved in energy metabolism in the body and are broken down according to the body’s needs. The fatty acids that are broken down are used as a source of calories for our vital activities. The fatty acids that are separated from triglycerides are free fatty acids, which are an efficient source of calories that can be used quickly for vital activities. In addition, subcutaneous fat has a similar function as insulation to maintain body temperature and protect the body from cold attacks, and as a cushioning material to protect the body from external attacks. In other words, triglycerides have played an important role in the evolution of human beings to adapt to the harshness of nature in order to survive. However, in the modern life with comfortable environment and abundant food materials, triglycerides are facing the danger of accumulating in excess. 4. Cholesterol Also a lipid, cholesterol cannot be used as energy. It has the role of a component of cell membranes. In addition, cholesterol can also be a raw material for important hormones such as vitamin D and sex hormones, and a raw material for bile acid, the main component of bile.