If you find yourself catching colds easily, it usually indicates that your immune system is weak. This could be due to a deficiency in trace elements such as vitamins, calcium, or zinc. It is advisable to get these trace elements tested at a hospital and then supplement accordingly. In daily life, you can also consume foods high in protein, calcium, and vitamin C. For example, you might include eggs, milk, or lean meats in your diet, and it is important to eat fresh fruits and vegetables to boost your vitamin C intake and enhance your resistance to illnesses. Additionally, it is recommended to exercise regularly to strengthen your physique. Exercising also increases metabolism and promotes excretion, which can further enhance your immune system.