Most people faint because of pressure on their pressure points, a lack of food or water, overheating or because of a lack of oxygen. Starving yourself of food or water is a very dangerous way to try and make yourself faint and should not be done. The same can be said for overheating, or any of the other methods. Fainting is your body’s way to reboot itself, get you out of danger and save the vital organs. It is an emergence response system that your body has and it should not be messed with.
Some say that if you know how to do it properly, pressure points are the ‘safest’ way to make yourself pass out. Others state that by putting your head between your knees, breathing really hard then standing up fast will also cause you to faint. There are no guarantees that either of these methods will work and they could just make you feel ill or do you damage.
If you do think you’re going to pass out then you will know it’s about to happen because your vision will narrow and you will feel dizzy. Try to sit down to avoid falling straight to the floor, lie down if you can. If you do black out and once you have regained consciousness you shouldn’t try to sit up straight away. If you can, elevate your legs so that the blood gets to your head as quickly as possible. Ask someone to get you a drink, preferably something that has both water and sugar, like juice.