Some Genetically Modified Foods (GMOs) include Bt genes obtained from Bacillus thuringiensis which is soil bacterium. Bt gene make foods resistant to insects.
B. thuringiensis itself has been used as an insecticide for many years and it is preferred to decrease toxic chemical usage to in USA and Europe. But nowadays, transgenic Bt corn, cotton potato, [...]

Although it has several disadvantage, there are some positive opinions about Genetically Modified Foods. These are;

More efficient varieties are obtained.
Product cost decrease due to high efficiency.
There is chance to enhance the product nutritionally and obtain the product with desirable food additives. Genetically Modified Foods are more alimentative.
By loading vaccine, cheaper method is provided to ill [...]

The technology, which supply new properties to the organism by transferring gene from one organism to another or by interference to genetic structure, is called “Gene Technology”.  Foods’ genetic structures are changed by this technology and these foods are called “Genetically Modified Foods”.
Ripening delayed tomatoes in 1994 is a first example of genetically modified food. [...]