Give 4 reasons why some people are at higher risk for Contracting foodborne illness?

Pregnant Women, Their Unborn Babies and Children.
Older Adults and People with Cancer, Diabetes, HIV/AIDS, Organ Transplants, and Autoimmune Diseases.
Foods to Avoid.
Foodborne Illness: Know the Symptoms.

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)