Why can heavy drinking lead to nutritional deficiencies?

Heavy drinking leads to nutritional deficiencies primarily because alcohol provides "empty calories"—energy that lacks essential vitamins, minerals, and amino acids. This process contributes to nutritional impairment in several ways:1

• Displacement of Nutrients: Alcohol consumption often replaces nutrient-rich food in an individual's diet.21
• Gastrointestinal Dysfunction: Heavy drinkers may experience digestive difficulties that prevent the body from properly absorbing essential food elements.21
• Metabolic Alterations: Chronic alcohol use causes widespread metabolic changes that increase the risk of nutritional-deficiency diseases.21

These deficiencies can lead to severe health conditions, such as thiamin deficiency—a hallmark of alcoholism often associated with Wernicke-Korsakoff syndrome—as well as pellagra (niacin deficiency), scurvy (vitamin C deficiency), and various forms of anemia resulting from deficiencies in folate or vitamin B12. Addressing these nutritional defects is critical, as they are the underlying cause of many chronic medical consequences associated with long-term alcohol abuse.21