Common nutrients often deficient in people's diets include iron, vitamin D, calcium, and magnesium. Iron deficiency can lead to anemia, particularly in women and vegetarians. Vitamin D is often lacking due to limited sun exposure and can impact bone health. Calcium is essential for strong bones, but many people do not consume enough dairy or other calcium-rich foods. Similarly, magnesium, vital for numerous bodily functions, is frequently underconsumed. Addressing these deficiencies through diet or supplements is crucial for promoting overall health and preventing various health issues.