Zinc deficiency occurs when the body does not get enough zinc, an essential mineral important for various bodily functions, including immune response, wound healing, and DNA synthesis. It can lead to symptoms such as hair loss, diarrhea, and delayed growth in children. Common causes of zinc deficiency include inadequate dietary intake, certain medical conditions, and absorption issues. Foods rich in zinc include meat, shellfish, legumes, seeds, nuts, dairy, and whole grains. Addressing zinc deficiency often involves dietary changes or supplementation under the guidance of a healthcare professional.