The Russian Academy of Sciences in Moscow ran a study whereby they fed rats with GM modified foodstuffs. After two years litters were being born dead or stunted, and the survivors were sterile.

I worry about what might be considered strange things. For years I've checked annual Chinese rice harvest statistics. As the population grows and arable land declines there comes a point at which a nation realizes it will be unable to feed its population. At that point bad things tend to happen, particularly when it comes to an emergent superpower. A few years ago, for the first time, they consumed more than they produced.

Recently, however, the mean rice yield per acre has increased significantly, and this is primarily down to the use of GM crops.

There needs to be a balance. There are clearly benefits to be had from modifying crops, but the potential for increased crops must be balanced with the inherent safety of the product. Simply because it's 'better' is no reason to embrace it unconditionally.

Another potential problem is the distribution of seeds which deliberately produce sterile plants. This could potentially lead to an enslavement culture where the seller has an absolute monopoly on who can even grow crops.

There's a lot of potential for negative results when it comes to GM foods. That may be true of many things, but when it comes to something as vital as food supply then regulations should be of the strictest standards. I doubt that is currently the case.