To increase hemoglobin levels quickly, it's important to address the underlying cause of low hemoglobin, such as iron deficiency anemia. Consuming iron-rich foods like lean meats, fish, poultry, beans, and dark leafy greens can aid in boosting iron levels. Additionally, incorporating foods high in vitamin C, which enhances iron absorption, can be beneficial. In some cases, iron supplementation may be necessary, but it's crucial to consult a healthcare professional for proper diagnosis and personalized advice based on your specific health condition.