Usually, people can recover their strength on the day of blood donation. Red blood cells and hemoglobin can gradually return to their pre-donation levels after 1 week. Plasma protein can be replenished within 1-2 days, and red blood cells and hemoglobin can be restored to pre-donation levels in 7-10 days. The human body stores blood in the liver, spleen and other organs. After an adult healthy person donates 200-400ml of blood at a time, the bone marrow metabolism is accelerated and the stored blood in the organs will rapidly enter the circulatory system to keep the circulating blood volume in balance. Usually, dizziness can occur after blood donation and the body can gradually recover after 30 minutes of rest. If it is your first time to donate blood, you can eat vitamin-rich foods such as apples, bananas, grapes, etc. You can also eat more blood-supplementing foods such as red dates, wolfberries, pig liver, pig blood, etc. In addition, you should avoid strenuous activities after blood donation to avoid discomfort, avoid intake of spicy foods and avoid frequent blood donation within a short period of time.