What are pesticides?
Generally, pesticides are the poisonous items used to kill. They are often marketed as insecticides, herbicides, or other. Some may or may not be also toxic to humans as well. According to groundwork.org, A pesticide is a poisonous chemical or mixture of chemicals that is produced or manufactured for preventing, repelling, or killing any pest.
Why should I care?
It is important to be aware of the chemical and potentially neurological effects on the body. Some are enzyme disruptors (which affects our neurological system, among other things), miscarriages, low IQ in children when pregnant women are exposed, carcinogens, or endocrine disruptors. There is also a lot of research linking Lou Gehrig's Disease (ALS) with pesticides.
What can I do?
Know the source of your food and whether or not pesticides were used. If they were, then don't buy it. If you don't know the source, don't buy it. Buying ORGANIC food can also be helpful. In the US, certified organic means that any pesticides used are naturally derived and not synthetic. It doesn't mean pesticide free.
For more information on pesticides and the alternatives to Monsanto-ville life (there are other companies, but Monsanto is a big one!), visit the Pesticide Action Network.
For information on what is likely on your conventionally grown food, check this out.