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We all know we need iron to live.
眾所周知，鐵是我們不可或缺的微量元素。
How else would our bloodcarry oxygen to our lungs?
如果不是通過鐵元素，我們的血液怎么能把氧氣送入肺部呢？
And cells need iron in order tomultiply.
細胞分裂也需要鐵元素的協助。
The problem is that our cells aren't the only ones whoneed iron in order to thrive.
但問題是，不僅正常細胞需要鐵元素幫助繁殖。
Cancer cells and harmful microorganisms like E.Coli and staph neediron, too.
癌細胞的分裂以及像大腸桿菌和葡萄球菌這樣的有害微生物的滋生也需要鐵元素。
The good news is that our bodies have several mechanisms for preventing dangerous invadersfrom getting the iron they need.
幸運的是，我們人體內有一些防御機制可以抵御有害入侵者，防止他們獲取所需的鐵元素。
Our bodies' defense strategy is to starve these invaders andcontain them.
我們人體對入侵者采取的防御戰略是：斷其糧草、形成牽制。
First, the level of iron in our blood plasma drops down dramatically, and our bodies reduce theamount of iron we absorb from our diet to a bare minimum until the danger is over.
首先，我們血漿中的鐵含量會急劇下降，同時我們的身體會盡量減少飲食中對鐵的吸收，直到危險解除。
Next, ourwhite blood cells have a protein that scavenges for loose iron atoms so that the invaders don't geta hold of them.
接下來，我們白血球中所含的一種蛋白質會清理游離的鐵原子，這樣入侵者就無法得到鐵。
Finally, to seal the deal, our immune system forms antibodies to the proteinreceptors the invaders use to acquire iron.
最后，為永絕后患，我們的免疫系統對入侵者用來捕獲鐵元素的蛋白受體形成抗體。
The next time the same organism invades, the seantibodies will completely block it from getting the iron it needs.
當微生物再次入侵時，它將會被這些抗體徹底阻擋在外，從而無法獲取所需的鐵。
No wonder, then, that having too much iron in your system can mean the difference between life and death.
另外，我們也不難理解為什么人體內鐵元素過量將事關生死。
Too much iron clogs our bodies' natural debris-control system and suppresses ourwhite blood cells.
大量的鐵元素會使人體自身對自由基的控制受阻并抑制白血球生長繁殖。
What's more, iron is a powerful oxidant, so when iron reacts with oxygen,it can damage the DNA in our cells and actually trigger the cancer process.
此外，鐵具有強氧化性，因此當其與氧氣發生反應時，可以破壞細胞中的DNA，從而引發癌變。
Help your body protect you by making sure that you're not consuming too much iron.
確保不要過量攝入鐵元素有助于你的機體對你形成保護。
Avoid ironsupplements unless your doctor prescribes them, and stop smoking. Tobacco is loaded with iron.
在未經醫囑的情況下，盡量不要補鐵，并且要戒煙，因為煙草中富含鐵元素。
