What vitamin deficiency causes anorexia?

Anorexia is generally associated with multiple factors. Vitamin deficiency may be one of the contributing causes, but not all cases of anorexia are directly caused by a deficiency in a single vitamin. A detailed analysis is as follows:

Vitamins play a role in regulating human metabolism. Deficiencies in B vitamins may affect neurotransmitter synthesis, leading to dysfunction of the appetite control center in the brain, while deficiencies in vitamins such as vitamin C may cause diminished taste sensation. These effects can reduce the desire to eat and potentially contribute to anorexia. However, the pathogenesis of anorexia is complex and closely linked to psychological factors—for example, cognitive distortions driven by an excessive pursuit of thinness—as well as genetic, familial, endocrine, and other factors acting in combination. In some patients, disordered eating behaviors appear first, and prolonged inadequate food intake subsequently leads to vitamin deficiencies, rather than vitamin deficiency being the initial cause of anorexia. Therefore, a single vitamin deficiency should not be regarded as the sole cause.

When signs of anorexia are detected, vitamin levels should be promptly evaluated. However, care should be taken to avoid focusing solely on nutritional supplementation while neglecting psychological intervention. Diet should emphasize variety and balance, incorporating fresh fruits, vegetables, whole grains, and other foods to ensure adequate vitamin intake. Family members should pay attention to the psychological state underlying eating behaviors, avoid blame or lecturing, and encourage open, positive communication. If anorexic symptoms persist, medical evaluation combined with psychological assessment is necessary, and treatment should integrate nutritional support with psychological therapy to prevent disease progression.