人体的脂肪有两大类,一类是中性脂肪,中性脂肪可随人的营养状况和机体活动的多少而变化。另一类为类脂,包括磷脂、胆固醇和胆固醇脂,是人体细胞膜的重要组成部分,也是合成胆盐、维生素D、类固醇激素的重要原料,是固定不变的。在正常情况下,肝脏只含有少量脂肪,约占肝脏重量的4％～7％,其中一半为中性脂 There are two main types of body fat, a class of neutral fat, neutral fat can be nutritional status with the human body and how much the body changes. The other is lipid, including phospholipids, cholesterol and cholesterol, is an important part of the human cell membrane, but also the synthesis of bile salts, vitamin D, steroid hormone important raw material is fixed. Under normal circumstances, the liver contains only a small amount of fat, accounting for about 4% to 7% of the liver weight, half of them are neutral lipids