Final answer:
Genetically modified foods have been marketed since 1994, starting with the FlavrSavr Tomato. Other GM crops have been grown on a large scale since then. The scientific consensus is that GMOs are safe to eat.
Step-by-step explanation:
Genetically modified foods, or GM foods, have been marketed since 1994, when the first GM crop, the FlavrSavr Tomato, was introduced. This tomato was genetically modified to have a longer shelf life and improved flavor. However, it did not stay in the market due to logistical issues. Since then, other GM crops such as field corn, soybeans, and cotton have been grown on a large scale. The general consensus among scientific organizations is that GMOs are safe to eat and have no more harmful effects than unmodified foods.