Now that you know how often can you donate blood, preparation is also important before donating blood. You need to eat a good and healthy meal before going to donate your blood. You also need to be well hydrated, otherwise, your blood might thicken.
Try to have some electrolyte drink handy with you, in case you start to feel dizzy and want something to put you back on track. Donation of blood can cause your body to become weak and it may lead to fatigue.