Blood donation, also called blood banking, is a wonderful thing to do. It is an easy and direct way to contribute to social work and help the community. Do you know what a high-sugar diet, smoking, and emotional stress do to your blood? All of these make your blood thick and slow moving, which increases your risk of having a blood clot or stroke. Repeated blood donations may help your blood to flow better, possibly helping to limit damage to the lining of your blood vessels (血管), which should result in fewer arterial (动脉) blockages.Blood donation isn’t a complicated issue, but we need to keep a few instructions in mind.Don’t go for blood donation with an empty stomach. We can eat anything and after having a right diet we’ll feel strong and comfortable to donate blood. Blood donation is a very fast process, but we need to take care of ourselves after blood donation. Make sure not to skip meals after blood donation. Smoking should be avoided up to one hour after blood donation.