Recent from talks
Long-term effects of alcohol
Knowledge base stats:
Talk channels stats:
Members stats:
Long-term effects of alcohol
The long-term effects of alcohol consumption on health are predominantly detrimental, with the severity and range of harms generally increasing with the cumulative amount of alcohol consumed over a lifetime. The extent of these effects varies depending on several factors, including the quantity and frequency of alcohol intake, as well as individual genetic and lifestyle factors. Alcohol is recognized as a direct cause of several diseases, including cancer. The International Agency for Research on Cancer (IARC) classifies alcohol as a Group 1 carcinogen, meaning it is capable of causing cancer in humans. Research shows a causal link between alcohol consumption and at least seven types of cancer, including cancers of the oropharynx (mouth and throat), esophagus, liver, colorectum, and female breast. The risk begins with any level of consumption and goes up with higher intake—even light or moderate drinking adds to the risk. No level of alcohol consumption has been identified as completely safe in terms of cancer risk. The biological mechanisms include the damage caused by acetaldehyde, a toxic byproduct of alcohol metabolism, which can alter DNA, and the generation of oxidative stress.
Beyond cancer, chronic and excessive alcohol use—as seen in alcohol use disorder—is capable of damaging nearly every part of the body. Such use is linked to alcoholic liver disease, which can progress to cirrhosis and chronic pancreatitis; various forms of cardiovascular disease, including hypertension, coronary heart disease, heart failure, and atrial fibrillation; and digestive conditions such as gastritis and stomach ulcers. Alcohol also interferes with how the body absorbs nutrients, which can lead to malnutrition. Long-term use can cause alcohol-related dementia and damage to the peripheral nervous system, leading to conditions like painful peripheral neuropathy. Drinkers are also more likely to get injured in accidents, including traffic accidents and falls, and may age faster.
Children and fetuses are especially at risk. Alcohol consumption during pregnancy can result in fetal alcohol spectrum disorders (FASDs), a range of lifelong physical, behavioral, and intellectual disabilities. In response to these risks, some countries now require alcohol packaging warning messages that mention cancer risks and pregnancy dangers.
Although some studies have proposed potential health benefits of light alcohol consumption—such as reduced risk of cardiovascular disease, type 2 diabetes, gastritis, and cholelithiasis— experts, including the World Health Organization (WHO), have questioned the validity of these studies, and say these possible benefits are small and uncertain when weighed against the well-known risks, especially cancer. While alcohol may provide short term effects of temporary stress reduction, mood elevation, or increased sociability, experts emphasize that, in the long run, the significant and cumulative health consequences of alcohol use outweigh these perceived psychosocial benefits.
The level of ethanol consumption that minimizes the risk of disease, injury, and death is subject to some controversy. Several studies have found a J-shaped relationship between alcohol consumption and health, meaning that risk is minimized at a certain (non-zero) consumption level, and drinking below or above this level increases risk, with the risk level of drinking a large amount of alcohol greater than the risk level of abstinence. Other studies have found a dose-response relationship, with lifetime abstention from alcohol being the optimal strategy and more consumption incurring more risk. The studies use different data sets and statistical techniques so they cannot be directly compared. Some older studies included former and occasional drinkers in the "abstainers" category, which obscures the benefits of lifetime abstention as former drinkers often are in poor health. However, the J-curve was reconfirmed by studies that took the mentioned confounders into account. Nonetheless, some authors remain suspicious that the apparent health benefits of light alcohol use are in large part due to various selection biases and competing risks. Mendelian randomization studies have been inconsistent regarding the risk curve, with three studies finding linear dose-response risks overall and two studies finding a J-shape for lipid profiles. The variance in alcohol consumption that is explained by genetics is small, requiring large sample sizes and potentially violating assumptions of the analysis.
As one reviewer noted, "Despite the wealth of observational data, it is not absolutely clear that alcohol reduces risk, because no randomized controlled trials have been performed." The National Institute on Alcohol Abuse and Alcoholism (NIAAA) announced a randomized controlled trial in 2017, but the National Institutes of Health (NIH) cancelled it in 2018 due to irregular interactions by the program staff with the alcohol industry. A trial in Spain is expected to complete in 2028.
In 2013, Norwegian psychiatrist Hans Olav Fekjær compared the situation to those of hormone replacement therapy (HRT), vitamin E, and β-carotene; similarly to alcohol, observational studies for each of these treatments showed significantly reduced risk of coronary heart disease, but initial randomized trials of these treatments failed to replicate the effect. For HRT, pooling multiple randomized control trials and stratifying the data by age and time since menopause showed the benefits were limited to treatment soon after menopause. For vitamin E, trials have shown that the benefits are limited to certain populations such as those with diabetes and a specific genotype. For β-carotene, the randomized trials have shown that β-carotene increases cardiovascular disease risk when supplemented, with all beneficial effects due to other vitamins in foods providing β-carotene.
In light of the conflicting evidence, many have cautioned against recommendations for the use of alcohol for health benefits. At a symposium in 1997, Dr. Peter Anderson of the World Health Organization (WHO) labeled such alcohol promotion as "ridiculous and dangerous". It has been argued that the health benefits from alcohol have been exaggerated by the alcohol industry, with industry participation in the wording of messages and warnings. The debate is not purely scientific, with groups such as the International Scientific Forum on Alcohol Research (ISFAR) critiquing anti-alcohol studies as distorting the evidence, scientists in turn accusing these groups of bias due to industry funding, and members of the groups responding that these are false and misleading assertions. Studies with industry funding find less risk of stroke, and industry-linked systematic reviews consistently find cardioprotective effects, compared to reviews with no associations being 54% positive.
Hub AI
Long-term effects of alcohol AI simulator
(@Long-term effects of alcohol_simulator)
Long-term effects of alcohol
The long-term effects of alcohol consumption on health are predominantly detrimental, with the severity and range of harms generally increasing with the cumulative amount of alcohol consumed over a lifetime. The extent of these effects varies depending on several factors, including the quantity and frequency of alcohol intake, as well as individual genetic and lifestyle factors. Alcohol is recognized as a direct cause of several diseases, including cancer. The International Agency for Research on Cancer (IARC) classifies alcohol as a Group 1 carcinogen, meaning it is capable of causing cancer in humans. Research shows a causal link between alcohol consumption and at least seven types of cancer, including cancers of the oropharynx (mouth and throat), esophagus, liver, colorectum, and female breast. The risk begins with any level of consumption and goes up with higher intake—even light or moderate drinking adds to the risk. No level of alcohol consumption has been identified as completely safe in terms of cancer risk. The biological mechanisms include the damage caused by acetaldehyde, a toxic byproduct of alcohol metabolism, which can alter DNA, and the generation of oxidative stress.
Beyond cancer, chronic and excessive alcohol use—as seen in alcohol use disorder—is capable of damaging nearly every part of the body. Such use is linked to alcoholic liver disease, which can progress to cirrhosis and chronic pancreatitis; various forms of cardiovascular disease, including hypertension, coronary heart disease, heart failure, and atrial fibrillation; and digestive conditions such as gastritis and stomach ulcers. Alcohol also interferes with how the body absorbs nutrients, which can lead to malnutrition. Long-term use can cause alcohol-related dementia and damage to the peripheral nervous system, leading to conditions like painful peripheral neuropathy. Drinkers are also more likely to get injured in accidents, including traffic accidents and falls, and may age faster.
Children and fetuses are especially at risk. Alcohol consumption during pregnancy can result in fetal alcohol spectrum disorders (FASDs), a range of lifelong physical, behavioral, and intellectual disabilities. In response to these risks, some countries now require alcohol packaging warning messages that mention cancer risks and pregnancy dangers.
Although some studies have proposed potential health benefits of light alcohol consumption—such as reduced risk of cardiovascular disease, type 2 diabetes, gastritis, and cholelithiasis— experts, including the World Health Organization (WHO), have questioned the validity of these studies, and say these possible benefits are small and uncertain when weighed against the well-known risks, especially cancer. While alcohol may provide short term effects of temporary stress reduction, mood elevation, or increased sociability, experts emphasize that, in the long run, the significant and cumulative health consequences of alcohol use outweigh these perceived psychosocial benefits.
The level of ethanol consumption that minimizes the risk of disease, injury, and death is subject to some controversy. Several studies have found a J-shaped relationship between alcohol consumption and health, meaning that risk is minimized at a certain (non-zero) consumption level, and drinking below or above this level increases risk, with the risk level of drinking a large amount of alcohol greater than the risk level of abstinence. Other studies have found a dose-response relationship, with lifetime abstention from alcohol being the optimal strategy and more consumption incurring more risk. The studies use different data sets and statistical techniques so they cannot be directly compared. Some older studies included former and occasional drinkers in the "abstainers" category, which obscures the benefits of lifetime abstention as former drinkers often are in poor health. However, the J-curve was reconfirmed by studies that took the mentioned confounders into account. Nonetheless, some authors remain suspicious that the apparent health benefits of light alcohol use are in large part due to various selection biases and competing risks. Mendelian randomization studies have been inconsistent regarding the risk curve, with three studies finding linear dose-response risks overall and two studies finding a J-shape for lipid profiles. The variance in alcohol consumption that is explained by genetics is small, requiring large sample sizes and potentially violating assumptions of the analysis.
As one reviewer noted, "Despite the wealth of observational data, it is not absolutely clear that alcohol reduces risk, because no randomized controlled trials have been performed." The National Institute on Alcohol Abuse and Alcoholism (NIAAA) announced a randomized controlled trial in 2017, but the National Institutes of Health (NIH) cancelled it in 2018 due to irregular interactions by the program staff with the alcohol industry. A trial in Spain is expected to complete in 2028.
In 2013, Norwegian psychiatrist Hans Olav Fekjær compared the situation to those of hormone replacement therapy (HRT), vitamin E, and β-carotene; similarly to alcohol, observational studies for each of these treatments showed significantly reduced risk of coronary heart disease, but initial randomized trials of these treatments failed to replicate the effect. For HRT, pooling multiple randomized control trials and stratifying the data by age and time since menopause showed the benefits were limited to treatment soon after menopause. For vitamin E, trials have shown that the benefits are limited to certain populations such as those with diabetes and a specific genotype. For β-carotene, the randomized trials have shown that β-carotene increases cardiovascular disease risk when supplemented, with all beneficial effects due to other vitamins in foods providing β-carotene.
In light of the conflicting evidence, many have cautioned against recommendations for the use of alcohol for health benefits. At a symposium in 1997, Dr. Peter Anderson of the World Health Organization (WHO) labeled such alcohol promotion as "ridiculous and dangerous". It has been argued that the health benefits from alcohol have been exaggerated by the alcohol industry, with industry participation in the wording of messages and warnings. The debate is not purely scientific, with groups such as the International Scientific Forum on Alcohol Research (ISFAR) critiquing anti-alcohol studies as distorting the evidence, scientists in turn accusing these groups of bias due to industry funding, and members of the groups responding that these are false and misleading assertions. Studies with industry funding find less risk of stroke, and industry-linked systematic reviews consistently find cardioprotective effects, compared to reviews with no associations being 54% positive.