Is It Safe to Drink Blood? (2024)

With such a high interest in vampires these days — they're all over television, movies, and bookstore shelves — many people may be wondering if humans really can survive as vampires.

Turns out, sucking blood isn't just fiction fun: In 2011, a 19-year-old Texas man named Lyle Bensley allegedly broke into a woman's apartment and bit her on the neck. This was not bedroom playacting between lovers; Bensley claimed to be a centuries-old vampire who needed blood to stay alive. The woman escaped and called police, and Lyle the would-be vampire was arrested for assault.

But is it safe to drink blood?

Related: How much blood is in the human body?

In very small amounts (say, a few teaspoons), and if the blood is free from pathogens (such as the many blood-borne diseases), blood might not harm you. Beyond that, watch out.

The strange fact is, blood, when drank, is toxic. When confined to places where blood is supposed to be — such as the heart, vessels, and so on — it is essential for life. But when ingested it's a very different story. Of course all toxins have doses, and just as a tiny bit of poison won't necessarily harm you, the more you eat or drink, the greater the danger.

Related: 7 strange ways that people act like vampires

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Is It Safe to Drink Blood? (1)

Because blood is so rich in iron — and because the body has difficulty excreting excess iron — any animal that consumes blood regularly runs a risk of iron overdose. While iron is necessary for all animals (and indeed most life), in high doses it can be toxic. This condition, called haemochromatosis, can cause a wide variety of diseases and problems, including liver damage, buildup of fluid in the lungs, dehydration, low blood pressure, and nervous disorders.

Even so, blood-feeding in humans seems to be more common than one might expect. John Edgar Browning of Georgia Tech, who has researched the practice, suggests in a BBC article that thousands of people across the United States drink blood for various reasons. Some of these people say the oxygen- and iron-enriched substance gives them energy, and none of the drinkers interviewed by Browning have had any ill effects from their behavior, so perhaps they didn't overdo the blood meals: "No vampire I’ve interviewed has complained of any medical complications as a result of consuming blood," Browning said, according to BBC.

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Unlike humans, the bodies of animals that digest blood have adapted specialized digestive mechanisms. According to Katherine Ramsland in her book "The Science of Vampires" (Penguin Putnam, 2002) the vampire bat, "requires an enormous intake of iron, which helps make hemoglobin for carrying oxygen from the lungs to the body tissues. Yet the iron intake is generally higher than what the bat needs, so it has a special process for secreting the excess. When ingested, the blood goes through a tract that's adapted for extracting nutrients. Research on this system suggests that bats have a mucous membrane along the intestinal tract that acts as a barrier to prevent too much iron from getting into their bloodstreams."

You, however, are not a vampire bat. Because humans did not evolve such an iron-extracting mechanism, drinking blood can kill us.

If you're thinking of sampling human blood, make sure there's a doctor handy — for you, not your victim.

Editor's Note: This article was first published on Sept. 2, 2011.

Originally published on Live Science.

Is It Safe to Drink Blood? (2)

Benjamin Radford

Live Science Contributor

Benjamin Radford is the Bad Science columnist for Live Science. He covers pseudoscience, psychology, urban legends and the science behind "unexplained" or mysterious phenomenon. Ben has a master's degree in education and a bachelor's degree in psychology. He is deputy editor of Skeptical Inquirer science magazine and has written, edited or contributed to more than 20 books, including "Scientific Paranormal Investigation: How to Solve Unexplained Mysteries,""Tracking the Chupacabra: The Vampire Beast in Fact, Fiction, and Folklore" and “Investigating Ghosts: The Scientific Search for Spirits,” out in fall 2017. His website is www.BenjaminRadford.com.

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Is It Safe to Drink Blood? (2024)

FAQs

Can blood rehydrate? ›

On their zero-gravity test flight, the researchers found that injecting a bag of dried blood with water and massaging it successfully rehydrated a small amount of blood. Their next experiment, however, will see if the same results can be garnered when handling a larger volume of blood.

What does drinking blood symbolize? ›

In some traditional cultures, it is believed that drinking the blood of another person or animal can impart certain qualities or powers, such as strength or fertility. However, in most modern cultures, drinking another's blood is considered taboo, and there may be legal and ethical consequences for doing so.

Why do I like to see my blood? ›

From this perspective, seeing one's own blood may lead to an increase in sympathetic activity, which, in the absence of imminent threat, is quickly followed by a strong parasympathetic response.

What happens if you drink vampire blood Vampire Diaries? ›

Vampire blood also has strong regenerative properties, and when ingested by a human (including Witches and werewolves who are untriggered or in human form), it will heal them of almost any wound and the majority of illnesses within seconds.

What happens if you dehydrate blood? ›

Low blood volume shock (hypovolemic shock).

This is one of the most serious, and sometimes life-threatening, complications of dehydration. It occurs when low blood volume causes a drop in blood pressure and a drop in the amount of oxygen in your body.

What can I drink to replenish blood? ›

Making drinks and smoothies with iron-rich foods, like spinach, kale, and prunes can increase a person's iron intake. Vitamin C sources, such as orange and kiwi fruit juices can also benefit iron absorption. Red blood cells contain an iron-rich protein called hemoglobin.

What does Jesus say about drinking blood? ›

[53] Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. [54] Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.

Why does the Bible say not to drink blood? ›

Let us return to the reasons for the prohibition on eating blood: “I have assigned it to you for making expiation for your lives upon the altar; it is the blood, as life, that effects expiation.” According to this metaphorical phrasing, it is as if it is God who grants blood to Israel, and he who performs the ritual, ...

Why is blood sacred in the Bible? ›

It could be recalled that in the sacrifices involving blood in the Old Testament, the blood symbolically represented life. It is the life (blood) of the victim that is the source of the atonement, which, of course, brings the hope of the sinner's union with a holy God.

What is it called when you love blood? ›

The etymological definition of hemophilia is love of blood and was a name suggested for the disease by a medical treatise in 1828. Ironically, if you ask any hemophiliac, he will probably reply that his feeling towards blood is anything but love. Blood is made up of two parts, a solid and a liquid one (plasma).

Why is blood scary? ›

Some believe this drop in heart rate and blood pressure leading to passing-out at the sight of blood may be an evolutionary fear reflex. It's thought to be a survival mechanism causing you to “play dead” in the presence of a predator, or if someone near you has been injured.

Why do I feel weird after I see blood? ›

Hemophobia is unique because it also produces what's called a vasovagal response. A vasovagal response means you have a drop in your heart rate and blood pressure in response to a trigger, such as the sight of blood. When this happens, you may feel dizzy or faint.

Why do vampires crave blood? ›

As explained in the discussion, vampires receive strength and energy through drinking human blood which is how they regain their life. This makes the act of drinking blood a life-giving and life-sustaining one, as a vampire can live off of the blood they consume.

How long can vampires live without blood? ›

According to popular fiction they can survive for centuries without feeding but it takes a toll on them physically and mentally. They dry up so to speak and their strength diminishes, mentally they sometimes go mad from the thirst.

Do vampires get stronger when they drink blood? ›

Properly hydrated vampires will drink blood every day, not just once a month. They will also be healthier and stronger.

How long does it take to rehydrate blood? ›

When you drink a glass of water, it takes approximately 15 minutes for your body to absorb the fluid. However, when you're dehydrated, it can take about three times as long (45 minutes) for fluids to make their way from the stomach into the bloodstream and to the rest of the body.

How do you know if your blood is dehydrated? ›

If you're dehydrated, you're also likely to have low blood pressure, especially when moving from a lying to a standing position, a faster than normal heart rate and reduced blood flow to your extremities.

What is the fastest way to cure dehydration? ›

What is the quickest way to rehydrate your body? Water is the best option for rehydrating your body, but oral rehydration solutions also provide essential electrolytes. These may be useful if you are dehydrated due to diarrhea or vomiting, or if you have been exercising intensely.

How do you hydrate blood cells? ›

By replenishing fluid loss on a daily basis and taking in enough electrolytes, you can help your cells stay adequately hydrated — which is exactly what they need to be. Article originally published February 28, 2023.

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