On the horizon are bananas that produce human vaccines against infectious diseases such as hepatitis B; fish that mature more quickly; fruit and nut trees that yield years earlier, and plants that produce new plastics with unique properties.
http://www.ornl.gov/sci/techresources/Human_Genome/elsi/gmfood.shtmlhttp://www.news.com.au/story/0,10117,18287532-421,00.html
'We can change our foods so that our most common staple foods will help guard against the onset of these diseases and will make a significant contribution to reducing the enormous expenditure of therapeutic medicine," he told the National Press Club at the time.

http://home.howstuffworks.com/question148.htm
For example, there is a widely used herbicide called Roundup, made by Monsanto. Roundup kills any plant that it touches. Monsanto has genetically modified soybeans and other crop plants to create "Roundup Ready" strains that are not affected by Roundup. By planting Roundup Ready seeds, a farmer can control weeds by spraying Roundup right over the crop. The crop completely ignores the herbicide, but the weeds are eliminated.

Darlms thinks it is good because it can keep people healthier and the risks are not to high.