【原创】八一八转基因食物对人类的

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纯属非生物专业人士瞎掰,欢迎板砖。

转基因食物到底有没有害呢?
- 对于个体,可能有害,也可能无害。总结:能躲则躲。
- 对于人类整体,基本估计无害,且听某细细道来:
人类从古猿进化而来,7百万年前从东非走出,来到各个新世界,见到各种新食物,本质上与今天碰上转基因食物没什么不同。在这适应新食物的过程中,能够比较好地适应的那部分人群占了上风,自身强壮,后代众多。按照达尔文的进化理论,适者生存,从今天的人口来看(全球70亿?),取用新食物并没有对人类整体造成伤害。因为这些食物并非毒药,并不是入口即死,所以即使有害,也是慢性的、长期积累的。也许并不反映在第一代摄入者身上,有可能几代之后才能显现。但是因为不可能有人做如此长时间的比较研究,最终谁也不知道确切结论。
转基因食物生产者,就跟天朝的食品生产商一样,只要东西不是入口即倒,没有直接的证据能把他们送上法庭,什么能赚钱就生产什么,不要指望他们会花几十年的时间来研究对个体的长远影响。而从人类整体的统计上来说,好像也不用担心会让人类绝了种。对于个体,谁也不知道自己是能适应的那一群呢还是不能的那部分。所以,各位就看自己的运气了。
 
第一次走出非洲是100万年前。
第二次走出非洲是13万年前。
 
都是百/狗来的

第一次走出非洲是100万年前。
第二次走出非洲是13万年前。

http://baike.baidu.com/view/11178.htm

在人类起源的问题上,有两个概念:人科的起源和智人(晚期智人即现代人)的起源。从目前的化石资料来看,对于人科的共同祖先约700万年前至500万年前起源于非洲的观点,学术界并无太大争议。对于智人的起源,学术界则存在两种假说。很多科学家支持“非洲起源说”,即目前生活在世界各地的现代人类的祖先在大约20万年前起源于非洲,然后在距今10万年以内离开非洲,向亚洲和欧洲扩散。还有少数科学家支持“多地区进化说”,认为各大洲人种是由当地的早期人类连续进化而来,即现代人是在欧亚非各自起源。


不过也许你更准确,走出来更迟些(就当吹牛,数字大些吸引眼球) 哈哈!
 
http://baike.baidu.com/view/11178.htm

在人类起源的问题上,有两个概念:人科的起源和智人(晚期智人即现代人)的起源。从目前的化石资料来看,对于人科的共同祖先约700万年前至500万年前起源于非洲的观点,学术界并无太大争议。对于智人的起源,学术界则存在两种假说。很多科学家支持“非洲起源说”,即目前生活在世界各地的现代人类的祖先在大约20万年前起源于非洲,然后在距今10万年以内离开非洲,向亚洲和欧洲扩散。还有少数科学家支持“多地区进化说”,认为各大洲人种是由当地的早期人类连续进化而来,即现代人是在欧亚非各自起源。

700万年前只是人类的起源说。第一次走出非洲是100-200万年前。现代人的第二次走出非洲是大约10万年前。都是学说。
 
如果人类基因那么不稳定, 容易和其他物种的基因混合配对的话,早几千年前,就可能有猪人,牛人,马人了
 
不是基因配对,是能否适应新食物。

如果人类基因那么不稳定, 容易和其他物种的基因混合配对的话,早几千年前,就可能有猪人,牛人,马人了

如华人中有较多的人不能很好地消化牛奶,就不利于在草原牧区生存发展(如果不考虑别的替代品如羊乳)。这应该是符合适者生存的理论的。

转基因食物对个体的影响可能是隐性的,这样对个体而言,危害可能更大,因为你不可能象喝牛奶不消化就改喝豆浆一样及时地规避不良后果,等到有所发现时,为时已晚。甚至我怀疑会有任何这方面的研究。一来这种长期研究没有什么经济效益,反过来会威胁生产商的利益;二来需要控制的变量太多,想想现在我们吃的东西来自全球各地,食物、饮料、药品中日新月异的各种添加剂,要想精确地测定某种转基因食物的长期影响很可能是Mission Impossible.
 
纯属非生物专业人士瞎掰,欢迎板砖。
。。。

转基因食物生产者,就跟天朝的食品生产商一样,只要东西不是入口即倒,没有直接的证据能把他们送上法庭,什么能赚钱就生产什么,不要指望他们会花几十年的时间来研究对个体的长远影响。

这种比喻很不恰当。

国内一些黑心的食品生产商,是把已经被科学和生活实践证明了有毒有害的东西加入食品中。而科学理论和实践都证明,转基因生产方式是安全的。
 
。。。二来需要控制的变量太多,想想现在我们吃的东西来自全球各地,食物、饮料、药品中日新月异的各种添加剂,要想精确地测定某种转基因食物的长期影响很可能是Mission Impossible.

按照你这种想法,世界上根本就不应该培育任何新的作物品种。把你句子里的“转基因”换成“杂交稻”,一样也可以这么说:要想精确地测定某种新的杂交稻的长期影响很可能是Mission Impossible。

就算你能测定100年的影响,那么101年的呢?1001年的呢?10001年的呢?怎么才算是精确地测定了长期影响?按照这样的思路,什么科学也不应该发展了。
 
这是你的误解

按照你这种想法,世界上根本就不应该培育任何新的作物品种。把你句子里的“转基因”换成“杂交稻”,一样也可以这么说:要想精确地测定某种新的杂交稻的长期影响很可能是Mission Impossible。

就算你能测定100年的影响,那么101年的呢?1001年的呢?10001年的呢?怎么才算是精确地测定了长期影响?按照这样的思路,什么科学也不应该发展了。

前面已经说过,转基因对人类很可能是整体上无害--不会让人类灭绝。但对个体人,结果就不好说。所以在人口和需求的压力下,是不得不为。做实验的都知道有个confidence的程度问题,样本越大,观察期越长,confidence就能更大。如果有两三代人体实验的结果,当然会比只看几月、几年的实验更可靠。就像吃棉籽油,几顿、几天恐怕看不出什么结果吧?可是几月、几年就可以看出后果了。



本文的意思是转基因统计上对人类整体很可能是有益无害的,但不能保证对每个个体都是“安全”的。但是因为检验的难度,可能最终谁都没有确凿的证据证实某一点。



你可以认为这也是一种环境的改变,个体或者适应而发展,或者不适应而衰落。得不出“什么科学也不应该发展了”的结论。
 
杂交稻的母本再远,也还是同种,就好比马和野马生下的肯定还是马。转基因则是把不同种的基因移植到一种作物中去,至少相当于马和驴生下的骡子吧。为什么骡子基本上都没有生育力,而马和野马生下的小马就没有这个问题呢?:rolleyes:
谈转基因,非要扯上根本不同性质的杂交稻,不知道是什么缘故。
以上纯属非专业人士的瞎想,欢迎专业人士拍砖。:blowzy::D
 
GM food toxins found in the blood of 93% of unborn babies
By SEAN POULTER
UPDATED: 10:07 GMT, 20 May 2011
http://www.dailymail.co.uk/health/article-1388888/GM-food-toxins-blood-93-unborn-babies.html

Toxins implanted into GM food crops to kill pests are reaching the bloodstreams of women and unborn babies, alarming research has revealed.
A landmark study found 93 per cent of blood samples taken from pregnant women and 80 per cent from umbilical cords tested positive for traces of the chemicals.
Millions of acres in North and South America are planted with GM corn containing the toxins, which is fed in vast quantities to farm livestock around the world – including Britain.
However, it is now clear the toxins designed to kill crop pests are reaching humans and babies in the womb – apparently through food.
It is not known what, if any, harm this causes but there is speculation it could lead to allergies, miscarriage, abnormalities or even cancer.
To date the industry has always argued that if these toxins were eaten by animals or humans they would be destroyed in the gut and pass out of the body, thus causing no harm.
Food safety authorities in Britain and Europe have accepted these assurances on the basis that GM crops are effectively no different to those produced using conventional methods.

But the latest study appears to blow a hole in these claims and has triggered calls for a ban on imports and a total overhaul of the safety regime for GM crops and food.
Most of the global research which has been used to demonstrate the safety of GM crops has been funded by the industry itself.

The new study was carried out by independent doctors at the Department of Obstetrics and Gynaecology, at the University of Sherbrooke Hospital Centre in Quebec, Canada.
They took blood samples from 30 pregnant women and 39 other women who were not having a baby.
They were looking for residues of the pesticides associated with the cultivation of GM food.
These include so-called Bt toxins, which are implanted using GM techniques into corn and some other crops.

Traces of Bt toxin were found in the blood of 93 per cent of the pregnant mothers – 28 out of 30. It was also found in 80 per cent of the umbilical cords – 24 out of 30.
In the non-pregnant group, traces were found in the blood of 69 per cent – 27 out of 39. It is thought the toxin is getting into the human body as a result of eating meat, milk and eggs from farm livestock fed GM corn.
The Canadian team told the scientific journal Reproductive Toxicology: ‘This is the first study to highlight the presence of pesticides associated with genetically modified foods in maternal, foetal and non-pregnant women’s blood.’
They said the Bt toxin was ‘clearly detectable and appears to cross the placenta to the foetus’.
Calling for action, the team said: ‘Given the potential toxicity of these environmental pollutants and the fragility of the foetus, more studies are needed.’
The director of GM Freeze, an umbrella group for community, consumer and environmental organisations opposed to GM farming, described the research as ‘very significant’.
Pete Riley said: ‘This research is a major surprise as it shows that the Bt proteins have survived the human digestive system and passed into the blood supply – something that regulators said could not happen.
‘Regulators need to urgently reassess their opinions, and the EU should use the safeguard clauses in the regulations to prevent any further GM Bt crops being cultivated or imported for animal feed or food until the potential health implications have been fully evaluated.’

The Agriculture Biotechnology Council, which speaks for the GM industry, questioned the reliability and value of the research.
Its chairman, Dr Julian Little, said: ‘The study is based on analysis that has been used in previous feeding studies and has been found to be unreliable.’
He said the toxins found are also used in other farming systems and gardening ‘with no harm to human health’.
Dr Little said: ‘Biotech crops are rigorously tested for safety prior to their use and over two trillion meals made with GM ingredients have been safely consumed around the world over the past 15 years without a single substantiated health issue.’
 
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