Safety Issues for GM Foods

i) the inserted gene may itself have adverse effects;
ii) the inserted gene may code for a protein that is toxic to human beings or produces an allergic reaction
iii) the inserted gene may alter the way existing genes in a plant or animal express themselves, which may in turn increase the production of existing toxins or switch on the production of previously silent genes;
iv) the inserted gene may alter the behaviour of a micro-organism, which is carrying it to make it potentially harmful;
v) the inserted gene may be transferred from a micro-organism which is carrying it to other micro-organisms, in the human gut or respiratory tract or to animals or humans;
vi) the consumption of a GM micro-organism may alter the balance of existing
micro-organisms in the human gut.