No... It can't be and never will. You are referring to those certain other genetically modified food items that may replace the natural order of food? I doubt. We have screwed with the nature. We did a million things. Created machines that are helpful and yet leading us to a state that deteriorates our immunity power. We built tall buildings and underground wells that is increasing the chances of Earthquakes and do we still have to decide if eating flesh is going to disorder the environment? After all those disasters that we have created, it gives us no right to question a natural diet. Man... It is natural. How can you just someday sit and decide that your a vegetarian and your doing good! No your not...

Proof is evidence. But if the evidence is not convincing enough, it isn't considered better than it was. Like Parapsychology is quite accomplished but it isn't legal yet. Lie detectors aren't evidences. Also, a man's statement who has a criminal record isn't a proof. Proof has to have the power to release a fair judgement. Sometimes fair... Sometimes not.