For example, the acetaldehyde that is formed during alcohol metabolism can interact with other proteins in the cells, interfering with their function. Therefore, it is possible that acetaldehyde also interacts with antibodies and thereby may alter antibody responses; however, this remains to be established (Thiele et al. 2008). Similarly, more work is needed to determine whether alcohol inhibits specific aspects of B-cell differentiation, such as immunoglobulin class switching and cell survival.

But unhealthy factors, like stress, smoking, or drinking alcohol, can be taxing for your immune system and make it harder for it to fight off infection. Long-term alcohol misuse can weaken your immune system, making you more vulnerable to serious infections. It can also weaken your bones, placing you at greater risk of fracturing or breaking them. This information is based on the assumption that you have a normal tolerance to alcohol. Alcohol has been linked to such diseases as acute respiratory distress syndrome, tuberculosis and pneumonia. It also can directly damage the lungs or result in restricted lung capacity, which causes difficulty breathing.

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You can also contract the virus if you touch a surface that has the virus on it. They include drugs to treat allergies, arthritis, lupus, IBS, and organ transplant. Corticosteroids are one example, as are TNF inhibitors for inflammation does alcohol suppress immune system and chemotherapy for cancer. “Alcohol temporarily dampens anxiety, negative emotions, and other uncomfortable feelings, but the relief is short-lived and negative emotions tend to increase when the buzz wears off,” Koob says.

But when you’ve ingested too much alcohol for your liver to process in a timely manner, the toxic substance begins to take its toll on your body, starting with your liver. “The oxidative metabolism of alcohol generates molecules that inhibit fat oxidation in the liver and, subsequently, can lead to a condition known as fatty liver,” says Dr. Menon. Your liver detoxifies and removes alcohol from the blood through a process known as oxidation. Once the liver finishes the process, alcohol becomes water and carbon dioxide. If alcohol accumulates in the system, it can destroy cells and, eventually, organs. Mark Hutchinson of the University of Adelaide in South Australia says that the results tally with post-mortem data showing that chronic drinkers have less immune chemicals in their blood than normal.

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Lastly, NK cells are abundant in the liver (Gao et al. 2009) and recognize cells that have low levels of a protein called class I major histocompatibility complex (MHC) on their surface. This reduced class I MHC expression can result from infection with certain types of viruses. NK cells eliminate cells with low class I MHC expression as well as cancer cells. Microglia express PRRs, produce cytokines, and modulate neuroinflammatory reactions in brain injury and neurodegenerative diseases (Block, Zecca et al. 2007). In Sprague Dawley rats exposed to 25% (w/v) ethanol via intragastric gavage every 8 hours for 4 days, increased activation and proliferation of microglia as evidenced by morphological changes and BrdU incorporation were observed in the hippocampus (McClain, Morris et al. 2011). Changes persisted at least 30 days after alcohol exposure suggestive of longlasting consequences of ethanol on microglia function (McClain, Morris et al. 2011).

The immune system is typically categorized into the innate and adaptive immune response systems, both of which are essential components in the body’s defense against pathogens. Though there’s still limited data on the link between alcohol and COVID-19, past evidence shows alcohol consumption can worsen the outcomes from other respiratory illnesses by damaging the lungs and gut, and impairing the cells responsible for immune function. “Anyone with chronic liver conditions should be avoiding alcohol, for example, people with hepatitis, nonalcoholic fatty liver disease, liver inflammation, and any condition that could affect liver function would be a reason to avoid alcohol,” notes Favini. The researchers emphasize that although their research suggests moderate alcohol consumption may benefit the immune system, they do not recommend that people with a history of alcohol abuse start to drink based on these findings.

Psychological effects

These foods may help your body make more of the white blood cells you need to fight off infections. Fresh produce and nuts and seeds pack a lot of zinc, beta-carotene, vitamins A, C, and E, and other nutrients you need for a healthy body. Plant-based foods also fill you up with fiber, which helps lower your body fat percentage, which can strengthen your immune response. As discussed above in the gene expression studies, the mechanisms by which ethanol exerts dose-dependent effects on the immune system could also include modulation of the hypothalamic-pituitary-adrenal (HPA) axis, which tightly regulates the stress response, in turn affecting immunity. Response to different stressors is mediated by several neural circuits that converge on the paraventricular nucleus (PVN) of the hypothalamus (Myers, McKlveen et al. 2014).

In addition to these changes in cytokine function, investigators also have shown a contribution of barrier dysfunction to the postinjury increase in infections in intoxicated people (Choudhry et al. 2004). Thus, alcohol intoxication can suppress chemokine production and impair the expression of proteins that allow neutrophils to adhere to other cells at the site of infection, which also contributes to increased susceptibility to infection. For example, in a model of lung infection, acute alcohol intoxication suppressed the production of certain chemokines (i.e., CINC and MIP-2) during infection and inflammation, thereby markedly impairing the recruitment of additional neutrophils to the site of infection (Boé et al. 2003). This defective neutrophil recruitment could be partially restored by localized chemokine administration (Quinton et al. 2005).

Thus, it appears that alcohol inhibits Th1 immune responses and may predispose the organism to Th2 responses and that this shift is at least partly mediated by suppression of IL-12. To elicit a response from the cell-mediated arm of the adaptive immunity, antigens need to be presented to the CD4+ and CD8+ T-cells. Studies in rodents found that chronic alcohol feeding can impair presentation of protein antigens in the spleen (Mikszta et al. 1995). Acute alcohol intoxication impairs the antigen-presenting ability of these cells (Mandrekar et al. 2004). In addition, alcohol markedly affects the differentiation of dendritic cells in blood and tissues (Ness et al. 2008).

Any amount of alcohol can diminish your judgment and functioning, and even low or moderate alcohol use can have harmful effects on different organs. 2The different immunoglobulin classes are involved in different aspects of the immune response. However, all immunoglobulins produced by one B-cell and its daughter cells specifically recognize the same antigen. You can lower the risk of alcohol impacting your immune system by drinking less. We need lots of different ‘good’ bacteria in our gastrointestinal (GI) tract for healthy immune function.

Without the proper number of white blood cells, the immune system cannot fight against diseases as well. T and B cell activation in the presence of retinoic acid results in the up-regulation of gut-homing molecules and generation of IgA-secreting B cells (Mora, Iwata et al. 2008). Consequently, deficiency in vitamin A results in the impairment of mucosal responses (Mora, Iwata et al. 2008). Vitamin D has long been known to have a critical role in calcium and phosphorous homeostasis. In addition, antigen presenting cells convert vitamin D to 1,25(OH)2VD3, a physiologically active form of vitamin D that is highly concentrated in lymphoid tissues (Mora, Iwata et al. 2008) where it can modulate function of T and B cells which express vitamin D receptors. Vitamin D deficiency results in reduced differentiation, phagocytosis and oxidative burst, by monocytes as well as defective bactericidal activity by keratinocytes (Fabri, Stenger et al. 2011, Djukic, Onken et al. 2014).

And it’s not just that you’re more likely to get a cold — excessive drinking is linked to pneumonia and other pulmonary diseases. It can also lead to a wide range of health problems, including high blood pressure and heart disease, liver disease, and increased risk of cancer. Alcohol alters the makeup of your gut microbiome — home to trillions of microorganisms performing several crucial roles for your health — and affects those microorganisms’ ability to support your immune system. It seems that drinking alcohol may also damage the immune cells that line the intestines and serve as the first line of defense against bacteria and viruses. A healthy immune system is made up of white blood cells, proteins, organs and other key components that work together to reduce or prevent long-term health issues. However, many things can compromise the immune system, including poor diet, lack of exercise and excessive alcohol consumption.