In terms of food, technically everything we eat is "genetically modified", in the sense that they don't occur in the same state as they did in the past. Most people would not recognise the ancestral forms of common foods like bananas, maize, rice and so on.
The only way that these crops transformed over time to be what we recognise today, is through changing their genes. These changes occur naturally, and are an integral mechanism for survival of living things in challenging circumstances. For instance, if a new disease emerges,...