There are no such things as vampires.
1. Vampires, defined as a humanoid that MUST consume blood or energy to survive do not exist. Cut and paste time, as it is too much work to type this out over and over and I “recycle” my own answers instead of retyping them.
2. The human body is not designed to process blood for nutrition. There is not enough protein, carbohydrates, and fats present in blood to maintain a complex creature such as Homo Sapiens or any theorized offshoot mutations. When a human ingests food it is broken up into a bolus by chewing, then churned up in the stomach with digestive juices to form a mass called chyme. It then passes through the pylorus into the duodenum, part of the small intestine where it mixes with bile salts and secretions from the pancreas and liver which continue breaking it down on a molecular basis. The broken down nutrients pass through the wall of the intestines and into the bloodstream where they are carried to each cell or stored for later use. Indigestible bulk continues through the intestines, turning a dark brown from the bile.
3. A person physically unable to process his own food for nutrition therefore also could not process blood – it’s the same process. Ingested blood does not transmit directly to the veins anyway – it would be chemically broken down by the digestive system.
4. Theoretical ingestion of blood to supply these nutrients would therefore have to occur at least once a day, and would require the ingestion of the entire blood supply which could not happen as the stomach is far too small to hold that much liquid volume. Hold up your clenched fist – under normal conditions your stomach is about that size. Furthermore, such a mass would be difficult to pass thru the intestines as it has no fibrous bulk, would create an intestinal impaction, causing massive vomiting from the large concentration of iron present, and any “real” vampire would have to eventually expel the waste, which would come out as a black, tarry, smelly goo, just as stool does when blood is present from a upper GI bleed.
5. Even if a vampire feeds once a week, and his victim also becomes a vampire, that is exponential growth, with 4 iterations a month. 1st iteration: 1 makes 1, total 2. 2nd iteration: 2 make 2, total 4. 3rd iteration: 4 make 4, total 8. 4th iteration: 8 make 8, total 16. 16 vampires at the end of 1 month, 256 at the end of the 2nd month, 4096 by the end of the 3rd month, 65,536 by the end of the 4th month, 1,048,476 at the end of the 5th, and 33,572,832 vampires at the end of half a year! Do the math – vampires are a mathematical impossibility.
6.The humans who profess to be vampires are victims of an all-encompassing self induced delusion. They are as human as you or I, regardless of their claims. Note that there is absolutely no scientific or medical proof that these people derive any benefit at all from the ingestion of blood, and even worse are the so-called “psychic” vampires, because their delusion is one that they cannot substantiate with any concrete evidence at all.
7. There is no “vampire” gene. People are not “born” as vampires. When a woman goes to the hospital for prenatal care there are many tests done on mother and child, even while still in the womb, to check for many things, including genetic anomalies that result in deformities and birth defects. If such a gene existed, in today’s world with today’s technology it would have been found – we have already completely sequenced the human genome. It would also have to follow Mendel’s law of dominant/recessive gene theory. Again, the odds on that many “vampires” all escaping the notice of the medical/scientific community are so low as to be almost nonexistent. The idea that there is a global “vampire community” engaging in controlled breeding to keep the “bloodline pure” is delusional in the extreme.