To naturally increase hemoglobin in a week, focus on iron-rich foods like spinach, red meat, lentils, and tofu. Combine these with vitamin C sources (e.g., oranges, tomatoes) to boost iron absorption. Include folate-rich foods such as eggs and leafy greens, and consume foods with vitamin B12, like dairy, fish, and fortified cereals. Avoid tea or coffee immediately after meals, as they hinder iron absorption. Stay hydrated and consider cooking with iron utensils. Regular physical activity and a balanced diet support overall blood health. If levels remain low, consult a healthcare professional for guidance or supplementation.