Should it be required to label GMO foods?

What allergies to GMO foods? Where's the study? Data on food allergies was not consistently collected prior to 1997, so it’s unknown how common they were before then. So all we can say is that allergies seem to be on the rise, that may be because we are too clean. If you do look at studies first born children have more allergies than other children in the same family. That maybe because first born are more "protected" than other children. So they don't get exposed to as much dirt, germs etc as other other children.