传统认为,肥肉因含饱和脂肪酸,胆固醇比瘦肉高,易促使动脉硬化。但新近的研究发现,瘦肉中含蛋氨酸丰富,蛋氨酸在人体内被酶催化脱去甲基成为同型半胱氨酸,而血中含有大量的同型半胱氨酸者,易产生动脉狭窄与血管栓塞。有偏吃瘦肉习惯而且血胆固醇高的人,比偏吃肥肉者更易发生动脉硬化。同时,营养学家证明,肥肉虽有含饱和脂肪酸及胆固醇较高的不利之处,但肥肉中含有长链的双碳多烯酸及α-脂蛋白,却可以阻止血管中胆固醇沉积 Traditionally, fat due to saturated fatty acids, cholesterol higher than lean, easy to promote atherosclerosis. However, recent studies have found that lean meat rich in methionine, methionine is enzymatically demethylated in the human body to become homocysteine, and the blood contains a lot of homocysteine, easy to produce arterial stenosis and blood vessels embolism. Some people who eat lean meat and high blood cholesterol, than those who eat more prone to fatty atherosclerosis. At the same time, nutritionists have shown that, although fatty acids contain high levels of saturated fatty acids and cholesterol disadvantage, but fat contains long-chain double-carbon polyunsaturated acid and alpha-lipoprotein, but can prevent blood vessel cholesterol deposition