• The added genes and the effect of cross pollination can cause non gm crops to produce allergy causing substances or toxins.
• Due to the fact that GM Foods are quite recent there has been no long term on human health tests or studies that have been carried out.
• The modification of the antibiotic marker gene in organisms can cause the outbreaks of a new human disease.
• GMOs can cause changes in the ecosystem.

Bibliography:

www.wikipedia.org