Signs of nutrient deficiencies may include fatigue, hair loss, and weakened immunity, which can signal inadequate intake of essential vitamins and minerals. Specific deficiencies may manifest as symptoms; for instance, a lack of iron can lead to anemia, resulting in breathlessness and tiredness. Similarly, a deficiency in vitamin D may contribute to bone pain and muscle weakness. Recognizing these signs early can allow individuals to adjust their diets or consult healthcare professionals for appropriate supplementation, ensuring optimal health and performance levels.