But scientists hadn't understood how excess weight affects the brain. Fat cells, they knew, manufacture and release substances into the bloodstream that flow to other parts of the body, including the heart and muscles. There, these substances jump-start biochemical processes that produce severe inflammation and other conditions that can lead to poor health.
但是,科学家们一直没有弄明白体重超重是如何影响大脑的。据他们所知,脂肪细胞可以制造出某些物质并将其释放入血液。这些物质随着血流来到身体的其他部位,包括心脏和肌肉等,然后在那里迅速启动一系列的生化过程,造成严重的炎症和其他疾病,导致健康状况恶化。
Many thought the brain, though, should be insulated from those harmful effects. It contains no fat cells and sits behind the protective blood-brain barrier that usually blocks the entry of undesirable molecules.
不过人们一直以为大脑应该可以从上述有害影响中幸免于难。因为大脑本身并不包含脂肪细胞,且它安居于血-脑屏障的保护之后,这道屏障通常足以将危险分子阻挡于大脑之外。
However, recent disquieting studies in animals indicate that obesity weakens that barrier, leaving it leaky and permeable. In obese animals, substances released by fat cells can ooze past the barrier and into the brain.
然而,近期的动物研究结果却十分令人不安。这些研究表明,肥胖可削弱血-脑屏障,使它变得具有泄漏性和渗透性。在肥胖动物中,脂肪细胞释放的物质可以突破血-脑屏障,进入大脑。
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