The levels of agricultural and chemical residues that are allowed in foods are considered safe and must represent the lowest level possible, complying with best industry practices.
The use of pesticides can dramatically increase crop production and ensure a higher quality of produce. However, pesticides are also toxic chemicals designed to kill agricultural pests, and some can cause problems if they are consumed by humans in large amounts.
In animal farming, drugs such as antibiotics and hormones are used to boost growth and cut down on feed requirements. Residues of these drugs can also be hazardous to humans. The level of harm from exposure to pesticides, animal antibiotics and hormones is dose related, meaning the more you consume, the greater the potential risk.