Which groups are identified as having the highest risk for severe outcomes from foodborne illness?

Professional athletes and people who follow strict calorie-restricted diets because they have higher metabolic demands and therefore worse outcomes with typical gastrointestinal infections.

Healthy middle-aged adults with regular access to medical care who rarely eat food prepared outside the home and thus have lower exposure risk.

Teenagers who exercise frequently and adults with active lifestyles who consume high-protein diets at most meals.

Elderly people, infants, and immunocompromised individuals.