Vampires require blood to consume in order to survive, hence blood may be equated to food and drink. Vampires are said to absorb various essences of the human body, such as thoughts, saliva, and fluids transferred during sexual activity, in addition to blood. This allows them to remain alive for an extended period of time without feeding.
Although they can survive for a long time without drinking blood, vampires do not naturally grow old. They can still be killed just like any other creature, with silver or garlic solutions being most effective.
The idea of vampires has been used throughout history to explain many different things from religion to illness. In modern times, the concept of the vampire has been used extensively in fiction and film. There are several different types of vampires including traditional, psychic, animated, and extraterrestrial.
Traditional vampires are human beings who have been turned into vampires by the evil curse of a witch or wizard. These vampires are able to feed on the blood of other humans to stay alive. However, they are not limited to drinking blood alone; they can also eat flesh, bone, and even alcohol.
Psychic vampires are fictional characters that appear in some comic books and role-playing games. With their ability to read minds and learn secrets, they are able to find out what type of blood someone is infected with and how to cure it.
While all vampires require blood to survive, some representations of vampires abhor the thought of harming or murdering people, thus they turn to animal blood. Others may need more than one type of blood meal per day.
Vampires also require certain substances in order to maintain their physical strength and mental clarity. These include garlic, wooden stakes, crosses, silver, and even sunlight!
Garlic is used as an anti-vampire measure because it will force a vampire to breathe through his/her mouth instead of his/her nose, which makes him/her vulnerable to attack. Wooden stakes can be used to pin a vampire to the ground; its body weight would then break the stake, causing damage from the wood. Crosses are used because vampires are known for turning people into copies of themselves, thereby killing them. This belief comes from the fact that when you make a crucifix out of silver metal, it becomes poisonous to vampires. Sunlight can kill vampires by burning them up, while also giving humans cancer. Vampires cannot withstand much light exposure without protection.
That being said, not all vampires can do these things. Some vampires may only have enough energy to feed on blood once a month, for example.
Vampires, as most people are aware, consume human blood. The blood of living humans is usually preferable, although animal blood will suffice. Any warm-blooded animal may provide the blood required for survival, and in extreme cases, cold-blooded species such as snakes and other reptiles may also suffice, albeit their blood is less efficient. Vampires cannot survive without feeding on blood; they require it for energy and to sustain their life processes.
Blood is an important component in many substances used in medicine today. Blood products, such as plasma and red blood cells, can be donated by volunteers who want to help others suffering from blood disorders. These products can be used by patients who need them to recover from injuries or surgeries. Some medical treatments depend on using blood proteins or factors derived from blood products. For example, platelets are used to control bleeding after injury or surgery. Plasma contains factors that promote clotting. Drugs can be tested on animals before being given to humans because many drugs are toxic to animals of some sort. If a drug causes adverse effects in animals, but not in humans, it is called "species specific." For example, acetic acid extracts of garlic are toxic to rats and mice, but not to humans or dogs. Garlic has been used for centuries as a natural remedy for many diseases, including infections, cancer, and cardiovascular problems. It works by killing bacteria, reducing inflammation, preventing tumor growth, etc.
People often ask me if vampires can kill a person with a single blow from their fist.