National Academy of Sports Medicine (NASM) Certified Sports Nutrition Coach 2025 – 400 Free Practice Questions to Pass the Exam

Iodine absorption primarily occurs in the small intestine, where nutrients are absorbed into the bloodstream. The small intestine has specialized cells that facilitate the uptake of various vitamins and minerals, including iodine. This nutrient plays a critical role in the synthesis of thyroid hormones, which regulate metabolism and other vital functions in the body.

The stomach and esophagus are not the main sites for iodine absorption. The stomach mainly functions in food digestion and the initial breakdown of nutrients, while the esophagus serves solely as a conduit for food moving from the mouth to the stomach. The colon, although important for water absorption and the formation of waste, is not significant for the absorption of iodine.

Understanding that the small intestine is the primary site for many essential nutrient absorptions, including iodine, helps reinforce the concept of digestive physiology and nutrient utilization in the body.