Cornstarch is a fine, white powder extracted from the endosperm of the corn kernel and is essentially a pure carbohydrate. In kitchens, it is used as a thickening agent for sauces, soups, and gravies. Some people consume it raw, prompting questions about its effects on the body. Understanding the impact requires looking closely at its nutritional makeup and how the body processes a pure starch in large amounts.
Nutritional Profile and Caloric Impact
Cornstarch is almost entirely carbohydrate, providing little to no protein, fiber, or fats. A single tablespoon contains approximately 30 calories, derived almost entirely from pure starch. It is considered a source of “empty calories” because processing removes nearly all vitamins and minerals.
The highly refined nature of cornstarch offers minimal nutritional value beyond energy. While its nutritional impact is negligible when used in small amounts for cooking, consuming large quantities provides a significant caloric load without supporting nutritional benefit. This profile contrasts sharply with whole foods.
Immediate Digestive and Metabolic Effects
When consumed raw, cornstarch causes a rapid change in metabolism. As a pure, refined carbohydrate, it has a high glycemic index, meaning it is quickly converted into glucose. This rapid digestion leads to a sharp spike in blood sugar levels, triggering the pancreas to release insulin. This response can be problematic, especially for individuals managing conditions like diabetes.
Raw starch can also be difficult for the digestive system to fully break down, leading to gastrointestinal discomfort. Undigested starch may ferment in the large intestine, potentially causing bloating, gas, and stomach pain. The lack of dietary fiber can also contribute to constipation when consumed regularly in large doses.
When Eating Cornstarch Becomes a Medical Concern
The compulsive consumption of raw cornstarch is a specific form of an eating disorder known as Pica. This disorder is characterized by the persistent craving and eating of non-food items, and the specific subtype involving starch is called amylophagia. This craving is often associated with an underlying nutritional deficiency, most commonly iron deficiency anemia.
In many cases, the pica behavior is a symptom of anemia and often resolves once the underlying iron deficiency is treated. However, continuous consumption of cornstarch introduces health risks. The high caloric density of the pure starch, when consumed in excess, can lead to substantial weight gain. Furthermore, the abrasive texture of the dry powder can cause wear on tooth enamel, potentially leading to dental damage. Individuals with a persistent urge to eat cornstarch should seek medical evaluation to address the behavior and rule out underlying nutritional issues.