Harmful effects of chronic ethanol consumption

Key Ways Ethanol is Harmful and Biochemical Mechanisms

• Acetaldehyde Toxicity:

• • Mechanism: Acetaldehyde is highly reactive and forms adducts with DNA, proteins, and other cellular molecules, leading to mutations, cellular damage, and increased cancer risk125.
• Oxidative Stress:

• • Mechanism: Ethanol metabolism generates excess NADH, which disrupts redox balance and increases reactive oxygen species (ROS), causing oxidative damage to cells and contributing to liver injury and inflammation15.
• Fatty Liver and Lipid Accumulation:

• • Mechanism: Excess NADH from ethanol metabolism inhibits fatty acid oxidation and promotes fatty acid synthesis, leading to fat accumulation in the liver (steatosis) and alcoholic fatty liver disease15.
• Mitochondrial Dysfunction:

• • Mechanism: Ethanol metabolism and ROS production impair mitochondrial function, reducing energy production and increasing cell death5.
• Neurotoxicity:

• • Mechanism: Ethanol and its metabolites can directly damage neurons and disrupt neurotransmitter function, leading to cognitive impairment, addiction, and withdrawal symptoms1.
• Carcinogenesis:

• • Mechanism: Chronic exposure to acetaldehyde and ROS increases the risk of cancer, particularly in the liver, mouth, throat, and esophagus12.
• Immune System Suppression:

• • Mechanism: Ethanol and its metabolites can suppress immune responses, increasing susceptibility to infections and cancer5.

In addition alcohol induces the cytochrome P450 oxidative system in the liver. this can affect the metabolism of many other chemicals leading to some medications to have dramatically lower therapeutic levels or elevated levels. This can lead to toxic levels of medications circulating in the body resulting in more side effects, a lower therapeutic benefit and in some cases death from toxicity.

Summary Table