If you have an hour to spare, this interview with Jeffrey M. Smith will be well worth the time. Smith documents how consumption of GM foods has been directly linked with health problems in humans.
In the video, Smith, of the Institute of Responsible Technology documents how consumption of genetically modified foods has been directly linked with reproductive problems, immune system deficiencies, accelerated aging, organ damage and gastrointestinal problems.
Smith explains that the immune system problem has been seen consistently in mice and rats who are fed GMO food, and now since humans have started consuming genetically modified foods, auto-immune diseases and allergies have increased.
He explains in detail the various chemicals used by Monsanto and other biotech industries and their impact on both health and the environment as a whole.
This is probably the most detailed interview yet on the dangers of GMOs.
The full biography of Smith can be read here.