The nutrient deficiency commonly associated with anemia is iron deficiency. Iron is crucial for the production of hemoglobin, which transports oxygen in the blood. Without adequate iron, the body cannot produce enough healthy red blood cells, leading to anemia symptoms such as fatigue, weakness, and pallor. Sources of iron include red meat, beans, spinach, and fortified cereals. In some cases, vitamin B12 and folate deficiencies can also contribute to anemia, emphasizing the need for a balanced diet rich in essential nutrients.