Eating food that contains pesticides can have a negative impact on humans.
Pesticides are chemicals that kill pests.
Eating food that contains pest-killing chemicals can have a negative impact on humans.
Eating food that contains what can have a negative impact on humans?

  * vitamins
  * antioxidants
  * Abnormal cell growth
  * pest-killing chemicals
  * Something that causes allergies
  * harmful substances
  * minerals
  * a pathogens