Unexpected food allergies can not be ruled out. This t together with the likelihood of increased herbicide use and perpetuation of intensive t agriculture has led environmentalists to a different conclusion. Genetically engineered soya bean is not the same as traditional soya bean. They would not pick up the difference between a free-range and a battery egg and would not have identified problems of feeding sheep protein to cattle which led to the outbreak of BSE in Britain. And it does not stop there.
Battery hens have a miserable life.
Using antibiotics in feed has created antibiotic resistant bacteria. Large-scale processing has led to contamination with Salmonella and disease in humans. These are the effects of the systems used in intensive egg production and their interactions with the environment. They cannot be predicted in the lab but have tangible impacts in the real world. The beef industry and the genetic engineering enterprise inhabit the same world.