GMO stands for genetically modified organisms. Such foods are modified and grown by use of chemicals. There have been plenty of studies carried out during which scientists proved that rats that are fed GMO foods suffer from various health issues, such as damaged immune system and cancerous cell development. GMO foods damage liver and brain and it usually takes no longer than 10 days to see how the inner organs are affected. In fact, many people think that GMO foods are approved by the FDA, but in reality they are not.