A 2013 study found that regular blood donation significantly lowered the mean total cholesterol and low-density lipoprotein cholesterol, protecting against cardiovascular disease. Researchers note this is consistent with findings in other studies which found that blood donors had a lower risk of heart disease and heart attack.
Donating blood regularly may also lower iron stores. This may reduce the risk of heart attack. High body iron stores are believed to increase the risk of heart attack.
Blood donation is safe for healthy adults. There’s no risk of contracting disease. New, sterile equipment is used for each donor.
Some people may feel nauseous, lightheaded, or dizzy after donating blood. If this happens, it should only last a few minutes. You can lie down with your feet up at the until you feel better.
You may also experience some bleeding at the site of the needle. Applying pressure and raising your arm for a couple of minutes will usually stop this. You may develop a bruise at the site.