Many toxic chemicals travel far from their sources through air, water, and food, and in products we use every day, such as plastics, cleaners, and pesticides. Some of these chemicals remain in the environment for a long time. Every person on earth carries toxic chemicals in their bodies. Toxic chemicals collect in the fat of people and animals, and in some plants. When people or large animals (such as bears, owls, hawks, or large fish) eat smaller animals, fish, or plants, toxic chemicals in them are passed along through the food chain or food web and accumulate in the bodies of those eating them. Two more good reasons not to be overweight, and to eat organic.