Final answer:
Immunocompromised individuals, due to medical conditions, and women of childbearing age are the populations that experience the most serious consequences of foodborne illnesses.
Step-by-step explanation:
The populations that experience the most serious consequences of foodborne illnesses are immunocompromised individuals, due to medical conditions, and women of childbearing age. Immunocompromised individuals have weakened immune systems, making it more difficult for their bodies to fight off infections. Women of childbearing age are at risk because certain foodborne illnesses, such as Listeriosis, can cause severe complications during pregnancy.