Organic farmers usually use animal manure respectively organic substances rather than man-made chemical fertilizers which add extra nutrients to the soil. Organic foods are unique to the way other products are produced as chemically treated food can cause a lot of harm to the environment by decreasing the quality of soil and increasing energy use, carbon emissions, pesticides and nitrate pollution. Also the used chemicals can cause severe damage to human cells and long term consumption can cause diseases like colon cancer (colorectal cancer), decrease fertility and take impact on the brain development of unborn children.