What are the three groups of people who are likely to be ill as a result of food poisoning?

People who live in unsanitary conditions may be more vulnerable to food poisoning. The food may be acceptable. But it'll be unacceptable in the body if the preparation is unclean or toxic. Those who have compromised immune systems or digestive problems also may be more vulnerable. Those who eat irritating or toxic foods or plants may be more vulnerable too. Additionally, those don't pay attention to expiration dates or proper preparation or storage methods may be more vulnerable.