Pica

Pica is a compulsive pattern of eating substances that are ordinarily regarded as inedible and nutritionally useless. The book introduces it while examining why some historical accounts of vampirism may have mistaken bodily symptoms, unusual appetites, or unexplained deaths for supernatural behavior. Its significance lies in the distinction between a real desire and the cultural interpretation imposed upon that desire: an appetite can be medically genuine without proving that the person who experiences it is a vampire.

Definition and Medical Context

Pica is described as a compulsion to ingest materials with no dietary justification, including substances such as soil, peeling paint, or chalk. It can arise in response to a deficiency of a particular vitamin or mineral, although it is more usually diagnosed when a person consumes items that offer no nutritional explanation and may actively endanger health. The book uses the example of pregnant women who eat chalk, possibly in an attempt to increase their calcium intake, while emphasizing that such behavior is not ordinarily part of a healthy diet.

The condition is presented as a disorder of appetite rather than as evidence of supernatural identity. That distinction matters because the surrounding discussion repeatedly separates physical observation from the stories later built around it. A person may experience an intense and inexplicable craving, yet the craving itself does not establish the folkloric cause assigned to it.

Blood, Iron, and Vampiric Interpretation

The book connects Pica to accounts of people who supposedly desired human blood. Blood would not directly benefit a person as food, but the desire for it could nevertheless be real. A lack of iron might produce a craving for the metallic taste of blood, while blood itself contains iron and could appear relevant in a case of anaemia. The medical possibility therefore offers a way to understand an alarming appetite without accepting the conclusion that the drinker possesses a supernatural need.

This comparison also exposes the instability of the vampire category. Folklore can turn an unusual bodily appetite into proof of otherness, particularly when observers lack medical knowledge or already expect the dead and diseased to threaten the living. Pica belongs to the book’s larger effort to distinguish symptoms, corpse changes, and cultural explanations from one another rather than allowing all three to collapse into the single label of vampirism.

Porphyria and the Limits of the Explanation

Pica appears alongside porphyria, a disease affecting the skin and nervous system that has often been invoked as a possible explanation for apparently vampiric behavior. In theory, porphyria can produce extreme sensitivity to sunlight, skin blistering and burning, psychosis, and red urine. Some accounts also associate it with a desire to drink blood, creating an apparent bridge between medical symptoms and vampire lore.

The book qualifies that bridge sharply. Porphyria is rare, and its supposed vampiric effects do not occur often or consistently enough to explain the many cases of alleged vampirism recorded across the centuries. The same caution applies to Pica: a medically plausible appetite may illuminate one fragment of a story, but it cannot serve as a universal explanation for the vampire tradition. The distinction between possibility and prevalence prevents a suggestive medical analogy from becoming a false historical theory.

Folklore, Infancy, and the Reclassification of Appetite

The book places unusual appetites within a broader history of misinterpreted bodies. Older vampire narratives frequently describe women who kill or consume babies and children. Some such stories may have developed from sudden infant death syndrome, malnutrition, or other losses whose causes were not understood. Parents could put a seemingly healthy child to bed and find the child dead the next morning; in societies where religious explanation carried more authority than science, the death could be attributed to an entity from outside the natural world.

The same interpretive process made women who cared for infants especially vulnerable to blame, since most babies were breastfed either by their mothers or by wet nurses. If a child died, suspicion could fall on the woman who had been responsible for feeding it. Pica thus belongs to a network of examples in which ordinary or pathological bodily processes are transferred into a supernatural narrative, and in which social assumptions determine who becomes the carrier of danger.

A Pattern of Medical Reinterpretation

The book’s treatment of Pica is reinforced by other explanations for supposed undead activity. Reports of blood around a corpse’s mouth or in its stomach can result from purge fluid released during decomposition. A body that appears not to decay may have been preserved by cold, an airtight coffin, heavy clay soil, or reduced bacterial activity. Saponification can produce adipocere, or corpse wax, leaving facial features intact and making a dead body resemble a strangely preserved revenant.

These examples share a central structure with the discussion of Pica. A material sign is observed, its cause is misunderstood, and a supernatural account supplies the missing explanation. The later scientific account does not make the original fear unreal; it shows how fear acquired its form. Pica is therefore important not because it proves or disproves vampires by itself, but because it demonstrates how a genuine bodily event can be recruited into a larger mythology of contamination, appetite, death, and return.