Which vitamins does alcohol most commonly deplete or damage?
Heavy alcohol use can reduce key vitamin levels directly (through poor intake and impaired absorption) and indirectly (by disrupting how the body processes nutrients). The vitamins most consistently affected include the B vitamins and vitamin A, with some evidence also pointing to vitamin D and vitamin E in chronic use.
B1, B6, and B9 (folate): the B vitamins most vulnerable
Alcohol is especially linked with loss of:
- Vitamin B1 (thiamine). Thiamine deficiency is a well-known risk in people who drink heavily, because alcohol interferes with thiamine uptake and storage.
- Folate (vitamin B9). Alcohol use can lower folate levels and raise the risk of anemia, partly through reduced intake and impaired absorption.
- Vitamin B6. Alcohol can affect B6 status and disrupt metabolism that depends on this vitamin.
Vitamin A: how alcohol increases deficiency risk
Alcohol can also raise the risk of vitamin A deficiency, which is tied to liver strain and impaired processing of fat-soluble nutrients (vitamin A is fat-soluble).
Are vitamin D and vitamin E also affected?
Chronic heavy alcohol use can be associated with low vitamin D and vitamin E in some people, but the relationship is less consistently singled out than the B vitamins and vitamin A. When deficiency happens, it often reflects a mix of reduced dietary intake, poor absorption, and liver-related effects.
Why these vitamins in particular?
The pattern aligns with alcohol’s two major effects:
- It reduces nutrition quality and intake.
- It impairs absorption and nutrient handling, including through liver dysfunction and gastrointestinal effects.
If you tell me whether you mean “heavy drinking” (chronic) or “a single occasion” (acute), I can narrow the list further to the most likely deficiencies for that situation.