转基因食品为什么不可怕 之四

Q：“什么是转基因 － BT毒素，让昆虫不敢来吃这个转基因作物，因为这个昆虫无法分解这个BT毒素。孟山都生产的DDT，昆虫也无法分解，那人类敢不敢吃DDT。你怎么知道BT毒素就不是DDT呢！！！”

A：这就是个mind game，文字游戏而已，说明什么？DDT不能吃，所以孟山都的所有产品都有毒？这叫什么逻辑。
更何况，BT虽叫毒素，但是本质就是一种蛋白质而已。而DDT是人工合成的化学品。人体从未接触过这种化学品。而人类从草履虫开始就在学习怎么对付蛋白质，怎么也有好几亿年了吧？

好吧BT毒素：
2013年7月26日5：16pm搜索pubmed“BT toxin”共有1495篇文章。其中综述类(review)122篇.搜索“BT toxin safety”共有64篇文字，其中19篇是综述。比如这篇是纽约康奈尔大学一个group做的综述：
http://www.ncbi.nlm.nih.gov/pubmed/11729093
全文：
http://www.annualreviews.org/doi/full/10.1146/annurev.ento.47.0

前言：
Transgenic plants expressing insecticidal proteins from the bacterium, Bacillus thuringiensis (Bt), are revolutionizing agriculture. Bt, which had limited use as a foliar insecticide, has become a major insecticide because genes that produce Bt toxins have been engineered into major crops grown on 
11.4 million ha worldwide in 2000. Based on the data collected to date, generally these crops have shown positive economic benefits to growers and reduced the use of other insecticides. The potential ecological and human health consequences of Bt plants, including effects on nontarget organisms, 
food safety, and the development of resistant insect populations, are being compared for Bt plants and alternative insect management strategies. Scientists do not have full knowledge of the risks and benefits of any insect management strategies. Bt plants were deployed with the expectation that the risks would be lower than current or alternative technologies and that the benefits would be greater. Based on the data to date, these expectations seem valid.

结论就是最后两句话：“Bt plants were deployed with the expectation that the risks would be lower than current or alternative technologies and that the benefits would be greater. Based on the data to date, these expectations seem valid.”翻译就是：人们期待BT植物比其他技术有更低的危险，更多的好处。根
据这些数据，这个期待是成立的。


一篇综述不是定论，但是1400多篇文章充分说明人类对这个问题进行了充分的研究，100多篇综述也说明从科学角度进行的大量的总结。这至少说明在科学上这不是一个没有充分研究的问题。当然，食品安全始终值得进一步研究。即使今天还是有人在不断研究花生，鸡蛋的安全问题。但是显然的是，绝大部分科研成果不为人知，公众和舆论也懒得关心这些问题。因此这不是科学问题，而是如何在公众中的宣传问题。就是说，是舆论导向问题。科学工作者任重而道远啊。