When you give your blood to the blood service, the first thing you will receive is sense of fulfillment. That is the most heroic deed any human can do. Keep sitting or lying on the chair or bed provided to you for 15-20 minutes to assess yourself for any discomfort. You can take some refreshments and return home. You can go back to your normal activities. However, avoid strenuous activities. Drink plenty of juices and water and eat iron-containing foods such as spinach black beans, lean meat and fish especially in the next 24 hours.