Which body system would be primarily affected if a person has difficulties absorbing nutrients from food?

The body system primarily affected when a person has difficulties absorbing nutrients from food is the digestive system. This system is responsible for breaking down food, processing nutrients, and facilitating their absorption into the bloodstream. If there are any issues such as inflammation, infection, or structural problems within the digestive tract, they can hinder the body's ability to absorb essential nutrients effectively.

For example, conditions like celiac disease, Crohn's disease, or irritable bowel syndrome can affect nutrient absorption, leading to malnutrition and other health issues. The digestive system plays a vital role in ensuring that the body receives the necessary vitamins, minerals, and other nutrients needed for energy, growth, and overall health. Consequently, when nutrient absorption is compromised, it directly points to problems within this system, making it the correct answer.