GMOs (Genetically modified food) are one of the biggest health disasters, they were introduced in 1996 and since that time within 9 years multiple chronic illnesses jumped from 7% to 13% and food allergies have doubled.
'The American Academy of Environmental Medicine has urged doctors to prescribe non-GMO diets as studies show GMO foods cause vital organ damage, immune system problems, accelerated aging, infertility, and dysfunctional regulation of insulin and cholesterol.
Genetically modified food works so that crops such as corn and soya are modified so that they can withstand the herbicides that are sprayed on the crop to kill the weeds but don't kill the crop.
There are concerns that GM foods could pose a health risk, including antibiotic resistance, the creation of new toxins, and the increase in allergies. GM foods are more widely used now and they don't have to be labeled so you, the consumer, can buy GM foods and not realize it.
Also, pollen, bees, insects, and wind can move this contaminated crop to nearby organic crops; the spread of this could be disastrous.
A study by the University of Newcastle in 2002 got people to eat GM food and found that after only one meal the GM material moved out of the food and entered the gut bacteria and remained there long after they stopped eating the GM food, affecting its role in digestion and protection of the gut.
In the US about 85% of the corn grown is genetically engineered and 91-93% of all soybeans are genetically engineered. Therefore nearly all the foods you buy containing either corn or soy will contain GMOs unless it's organic.