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【听力文摘】脂肪储存的来龙去脉

2014-08-26    来源:普特英语听力    【      美国外教 在线口语培训
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The Ins And Outs Of Fat Storage

When you eat a fatty food, it moves through the stomach and on to the intestines. In the intestines, a number of processes occur to transfer fat from the food to special fat cells in your body.

First, the gall bladder produces bile that breaks the food’s fat droplets into smaller droplets. Next, the pancreas secretes enzymes that attack the fat droplets and break them down into two parts: fatty acids and glycerol.

This happens because fat droplets are too big to pass through cell membranes. The broken down fat is absorbed by the cells lining the intestine, where it is reassembled into fat molecules and eventually shuttled into the bloodstream with the help of lipoprotein particles.

For the most part fat is stored in the fat cells that compose fatty tissue. Think of a fat cell as a tiny plastic bag filled with a drop of fat. Interestingly, fat cells do not multiply. The body contains a finite number of fat cells that expand as they absorb fat.


So how can you make those fat cells smaller? Eat well and exercise. When you work out, your body burns energy, primarily in the form of glucose. After breaking down stores of carbohydrates to produce glucose, the body goes after fat, which it breaks down into fatty acids that can also be used to make glucose.

脂肪储存的来龙去脉

当你食用富含高脂肪的食物时,脂肪通过胃流入肠道。在肠道中,脂肪经过一系列的消化流程从食物转化为体内的特殊脂肪细胞。

首先,胆囊分泌胆汁分解食物脂肪滴,使其更小。然后,胰腺分泌胰腺酶作用于脂肪滴,将其分解为两个部分:脂肪酸和甘油。

这是因为脂肪滴过大,无法穿过细胞膜。分解的脂肪被肠粘膜细胞吸收,重组成脂肪细胞,最后负载在脂蛋白颗粒上进入血液循环。

大部分的脂肪储存在脂肪细胞内,形成脂肪组织。脂肪细胞好比一个容纳脂肪滴的塑料袋。有趣的是,脂肪细胞并不会变多。身体内的脂肪细胞数量有限,它们在吸收脂肪后体积膨胀。

那么,如何使得这些脂肪细胞变小?健康饮食和运动。运动时,身体消耗葡萄糖以燃烧能量。当储备的碳水化合物转化成的葡萄糖被完全消耗后,身体就开始分解脂肪,由此产生脂肪酸,而脂肪酸也会产生葡萄糖。

【本译文由普特网友 yaksaput  提供】



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