Inadequate iron intake can lead to which of the following health issues?

Inadequate iron intake is primarily linked to anemia, which is a condition where there is a deficiency of healthy red blood cells or hemoglobin in the blood. Iron is a crucial component of hemoglobin, the molecule responsible for carrying oxygen from the lungs to the rest of the body. When there is not enough iron available, the body cannot produce adequate quantities of hemoglobin, leading to reduced oxygen transport and the symptoms associated with anemia, such as fatigue, weakness, and pallor.

The other options do not relate directly to iron deficiency: rickets is caused by a lack of vitamin D, calcium, or phosphate; goiter is linked to insufficient iodine in the diet; and poor teeth health is more often associated with a lack of vitamins and minerals but is not specifically caused by iron deficiency. Thus, anemia emerges as the clear health issue resulting from inadequate iron intake.