NANP Board Practice Exam

Which fiber is particularly effective as a metal chelator in the digestive tract?

1. Soluble fibers

2. Psyllium

3. B-glucans

4. Cellulose

The correct answer is: Soluble fibers

The correct answer highlights that soluble fibers, particularly certain types, can play a role in the chelation of metals within the digestive tract. Soluble fibers dissolve in water and can form gels, which helps them bind to various compounds, including metals. This binding can assist in the excretion of harmful heavy metals from the body, reducing their absorption and potential toxicity. Psyllium, while also a soluble fiber, is primarily known for its beneficial effects on digestion and cholesterol levels rather than its specific chelation properties for metals. Beta-glucans are a type of soluble fiber that primarily focuses on supporting immune function and lowering cholesterol levels rather than metal chelation. Cellulose, being an insoluble fiber, does not dissolve in water and does not have the same capability to chelate metals as soluble fibers do. Its primary role is related to bulk formation in the intestine and promoting regular bowel movements. Thus, soluble fibers are versatile components that can effectively aid in managing metal ions in the digestive tract.