对整个生物来说,每个细胞都是机体的一个微环境,它生长、消耗、不断更新,最终死亡。在这一连续的过程中,细胞需要保护,以免受到伤害、中毒和过早衰老。在机体正常的损耗中,衰老和损伤的细胞被自然产生的氧化剂和自由基降解,而降解作用时所产生的降解产物必须及时清理,才能防止污染附近的其他细胞乃至整个机体,这是正常的损耗过程。一旦损耗过程失控,降解的速率超出修复速率,就会导致各种疾病的发生。关于衰老,尤其是对早衰,有一种理论认为是由于氧化剂的活性过高,或是由于氧化剂与天然抗氧化剂自由基清除因素如维生素A、C、E以及维生素A的前体β—胡萝卜素之间未能达到平衡所 For the entire organism, each cell is a microenvironment of the body that grows, consumes, is constantly updated, and eventually dies. During this continuous process, cells need to be protected from harm, poisoning and premature aging. In the body’s normal wear and tear, the aging and damage of cells by the natural oxidants and free radicals degradation, and degradation of degradation products must be promptly cleared to prevent contamination of other cells in the vicinity and the entire body, which is normal Loss process. Once the depletion process is out of control, the rate of degradation beyond the repair rate can lead to various diseases. With regard to aging, especially with premature aging, one theory is that due to the over-activity of oxidants or due to oxidants and natural antioxidant free radical scavengers such as vitamins A, C, E and precursors of vitamin A, β-carotene Between the balance failed to reach