Moderate Alcohol Consumption Is Not Associated with Reduced All-cause Mortality

Association between alcohol consumption and all-cause mortality, cardiovascular disease, and chronic kidney disease: A prospective cohort study

In recent years, significant progress has been achieved in comprehending the impact of alcohol consumption on adverse health outcomes. However, the quality of evidence remains limited. Our objective was to conduct a prospective study examining the relationship between different types of alcoholic beverages and the risk of all-cause mortality, cardiovascular disease (CVD), and chronic kidney disease (CKD), and identifying the thresholds of safe dose stratified by sex using data from the UK Biobank. 502,490 participants were enrolled. These participants were initially registered between 2006 and 2010, and underwent reassessment between 2012 and 2013. All participants completed a detailed questionnaire on their alcohol consumption, including total alcohol consumption yesterday, weekly consumption of red wine, champagne plus white wine, beer, spirits, and fortified wine. All-cause mortality and the incidence of CVD and CKD were considered as the primary outcomes. 2852 participants reported CKD during a median follow-up period of 11.94 years, while 79,958 participants reported CVD over a median follow-up period of 11.35 years. Additionally, 18,923 participants died over a median follow-up period of 11.89 years. After adjusting for variables such as age, sex, education level, smoking status, diet score, and exercise score, total alcohol consumption showed a U-shaped relationship with the risk of CVD and all-cause mortality, but showed an inverse association with the risk of CKD. Upon further classification of alcoholic beverages, our analysis revealed that red wine, champagne plus white wine, beer, spirits, and fortified wine presented a U-shaped relationship with the risk of all-cause mortality and CKD. However, spirits were positively associated with the risk of CVD, only red wine, champagne plus white wine, beer, and fortified wine showed a U-shaped relationship with the risk of CVD. The safe doses of total alcohol consumption should be < 11 g/d for males and < 10 for females, red wine consumption should be < 7 glasses/week for males and < 6 for females, champagne plus white wine consumption should be < 5 glasses/week, and fortified wine consumption should be < 4 glasses/week. Red wine, champagne plus white wine, beer, and fortified wine below the corresponding thresholds of safe dose in our analysis were significantly associated with a lower risk of all-cause mortality, CVD, and CKD. And these alcoholic beverages under safe doses exhibited a protective effect against conditions like diabetes, depression, dementia, epilepsy, liver cirrhosis, and other digestive diseases, while didn't increase the risk of cancer.

Alcohol Use and Mortality Among Older Couples in the United States: Evidence of Individual and Partner Effects

BACKGROUND AND OBJECTIVES

Spouses with concordant (i.e., similar) drinking behaviors often report better quality marriages and are married longer compared with those who report discordant drinking behaviors. Less is known regarding whether concordant or discordant patterns have implications for health, as couples grow older. The present study examined whether drinking patterns among older couples are associated with mortality over time.

RESEARCH DESIGN AND METHODS

The Health and Retirement Study (HRS) is a nationally representative sample of individuals and their partners (married/cohabiting) over age 50 in the United States, in which participants completed surveys every 2 years. Participants included 4,656 married/cohabiting different-sex couples (9,312 individuals) who completed at least 3 waves of the HRS from 1996 to 2016. Participants reported whether they drank alcohol at all in the last 3 months, and if so, the average amount they drank per week. Mortality data were from 2016.

RESULTS

Analyses revealed concordant drinking spouses (both indicated they drank in the last 3 months) survived longer than discordant drinking spouses (1 partner drinks and the other does not) and concordant nondrinking spouses. Analysis of average drinks per week showed a quadratic association with mortality such that light drinking predicted better survival rates among individuals and their partners compared with abstaining and heavy drinking. Further, similar levels of drinking in terms of the amount of drinking were associated with greater survival, particularly among wives.

DISCUSSION AND IMPLICATIONS

This study moves the field forward by showing that survival varies as a function of one's own and one's partner's drinking.

Sustained Hypothetical Interventions on Midlife Alcohol Consumption in Relation to All-Cause and Cancer Mortality: The Australian Longitudinal Study on Women's Health

No randomized controlled trial has evaluated the effect of long-term alcohol interventions on mortality. Results reported in existing observational studies may be subject to selection bias and time-varying confounding. Using data from the Australian Longitudinal Study on Women's Health 1946-1951 birth cohort, collected regularly from 1996-2016, we estimated all-cause and cancer mortality had women been assigned various alcohol interventions (in categories ranging from 0 to >30 g/day ethanol, or reduced to ≤20 g/day if higher) at baseline, and had they maintained these levels of consumption. The cumulative risks for all-cause and cancer mortality were 5.6% (10,118 women followed for 20 years) and 2.9% (18 years), respectively. For all-cause and cancer mortality, baseline ethanol up to 30 g/day showed lower risk and >30 g/day showed higher risk relative to abstention. Had women sustainedly followed the interventions, a similar relationship was observed for all-cause mortality. However, the negative association observed for intakes ≤30 g/day and positive association for intakes >30 g/day was not evident for cancer mortality. Our findings suggest that all-cause mortality could have been lower than observed if this cohort of women had consumed some alcohol (no more than 30 g/day) rather than no consumption, but cancer mortality might not.

Alcohol consumption promotes arsenic absorption but reduces tissue arsenic accumulation in mice

Alcohol consumption alters gut microflora and damages intestinal tight junction barriers, which may affect arsenic (As) oral bioavailability. In this study, mice were exposed to arsenate in the diet (6 μg/g) over a 3-week period and gavaged daily with Chinese liquor (0.05 or 0.10 mL per mouse per day). Following ingestion, 78.0% and 72.9% of the total As intake was absorbed and excreted via urine when co-exposed with liquor at daily doses of 0.05 or 0.10 mL, significantly greater than when As was supplied alone (44.7%). Alcohol co-exposure significantly altered gut microbiota but did not significantly alter As biotransformation in the intestinal tract or tissue. Significantly lower relative mRNA expression was observed for genes encoding for tight junctions in the ileum of liquor co-exposed mice, contributing to greater As bioavailability attributable to enhanced As absorption via the intestinal paracellular pathway. However, As concentration in the liver, kidney, and intestinal tissue of liquor-treated mice was decreased by 24.4%-42.6%, 27.5%-38.1%, and 28.1%-48.9% compared to control mice. This was likely due to greater renal glomerular filtration rate induced by alcohol, as suggested by significantly lower expression of genes encoding for renal tight junctions. In addition, in mice gavaged daily with 0.05 mL liquor, the serum antidiuretic hormone level was significantly lower than control mice (2.83 ± 0.59 vs. 5.40 ± 1.10 pg/mL), suggesting the diuretic function of alcohol consumption, which may facilitate As elimination via urine. These results highlight that alcohol consumption has a significant impact on the bioavailability and accumulation of As.

Alcohol use in the older adult US population: Trends, causes, and consequences

Alcohol use, binge drinking, and alcohol use disorders have been increasing among older adults in the US population, including adults over 50 as well as adults over 65. Increases in consumption are sharper among women, and among those who use additional substances such as cannabis, and those who are relatively healthy in older adulthood (i.e. those without multimorbidites). This commentary describes these trends as well as provides hypotheses, and the data underlying them, for both supply-side (alcohol marketing and messaging) and demand-side (healthier aging, increased financial stress) potential drivers of these increases. The need for additional resources and focus on older adult drinking is increasingly urgent, as alcohol-attributable deaths escalate among older adults in the United States.

Trajectories of alcohol consumption in relation to all-cause mortality in patients with cardiovascular disease: a 35-year prospective cohort study

BACKGROUND AND AIMS

Research into alcohol consumption and cardiovascular disease (CVD) patients' prognosis has largely ignored the longitudinal dynamics in drinking behaviour. This study measured the association between alcohol consumption trajectories and mortality risk in CVD patients.

DESIGN

Prospective cohort study.

SETTING

UK-based Whitehall II Study.

PARTICIPANTS

A total of 1306 participants with incident non-fatal CVD (coronary heart disease/stroke) events.

MEASUREMENTS

Up to eight repeated measures of alcohol intake were available for each patient from the most recent assessment phase pre-incident CVD and all subsequent phases post-incident CVD, spanning up to three decades. Six trajectory groups of alcohol consumption were identified using group-based trajectory modelling and related to the risk of all-cause mortality, adjusting for demographics and changes in life-style and health status.

FINDINGS

Three hundred and eighty deaths were recorded during a median follow-up of 5 years after patients' last alcohol assessment. Compared with patients who consistently drank moderately (≤ 14 units/week), former drinkers had a greater risk of mortality (hazard ratio = 1.74, 95% confidence interval = 1.19-2.54) after adjustment for covariates. There was no significantly increased risk of mortality in long-term abstainers, reduced moderate drinkers, stable or unstable heavy drinkers. Cross-sectional analyses based only on drinking information at patients' last assessment found no significant differences in mortality risk for abstainers, former or heavy drinkers versus moderate drinkers.

CONCLUSIONS

Cardiovascular disease patients who consistently drink ≤ 14 units/week appear to have a similar risk of mortality to those who are long-term abstainers, which does not support a protective effect of moderate drinking on total mortality. Cardiovascular disease patients who stop drinking appear to have increased mortality risk compared with continuous moderate drinkers, but this may be linked to poor self-rated health before cardiovascular disease onset.

A systematic review of self-report measures used in epidemiological studies to assess alcohol consumption among older adults

Background

There is a lack of standardization regarding how to assess and categorize alcohol intake in older adults. The aim of this study was to systematically review methods used in epidemiological studies to define drinking patterns and measure alcohol consumption among older adults.

Methods

A systematic search was conducted in the MEDLINE, PubMed, PsycINFO, EMBASE, and CINAHL databases for studies published from January 2009 to April 2021. Studies were included if they were observational studies with a quantitative design; the mean age of the participants was ≥ 65 years; questionnaires, screening tools, or diagnostic tools were used to define alcohol consumption; and alcohol consumption was self-reported.

Results

Of 492 studies considered, 105 were included. Among the 105 studies, we detected 19 different drinking patterns, and each drinking pattern had a wide range of definitions. The drinking patterns abstaining from alcohol, current drinking, and risk drinking had seven, 12 and 21 diverse definitions, respectively. The most used questionnaire and screening tools were the quantity-frequency questionnaire, with a recall period of 12 months, and the full and short versions of the Alcohol Use Disorders Identification Test, respectively.

Conclusion

No consensus was found regarding methods used to assess, define, and measure alcohol consumption in older adults. Identical assessments and definitions must be developed to make valid comparisons of alcohol consumption in older adults. We recommend that alcohol surveys for older adults define the following drinking patterns: lifetime abstainers, former drinkers, current drinkers, risk drinking, and heavy episodic drinking. Standardized and valid definitions of risk drinking, and heavy episodic drinking should be developed. The expanded quantity-frequency questionnaire including three questions focused on drinking frequency, drinking volume, and heavy episodic drinking, with a recall period of 12 months, could be used.

Alcohol consumption in relation to cardiovascular and non-cardiovascular mortality in an elderly male Chinese population

Background

We investigated the association of alcohol consumption with cardiovascular and non-cardiovascular mortality in elderly Chinese men.

Methods

Our participants were recruited from residents living in a suburban town of Shanghai (≥60 years of age, n = 1702). Alcohol intake was classified as non-drinkers, past drinkers (stopped drinking for ≥12 months), and current light-to-moderate (1 to 299 g/week) and heavy drinkers (≥300 g/week). Alcoholic beverages were classified as beer/wine, rice aperitif and liquor/mix drinking.

Results

During 5.9 years (median) of follow-up, all-cause, cardiovascular and non-cardiovascular deaths occurred in 211, 98 and 113 participants, respectively. The corresponding incidence rates were 23.6/1000, 10.9/1000 and 12.6/1000 person-years, respectively. Both before and after adjustment for confounding factors, compared with non-drinkers (n = 843), past drinkers (n = 241), but not the current light-to-moderate (n = 241) or heavy drinkers (n = 377), had a higher risk of all-cause (adjusted hazard ratio [HR] 1.90, 95% confidence interval [CI] 1.35–2.68, P = 0.0003) and non-cardiovascular mortality (HR 2.46, 95% CI 1.55–3.91, P = 0.0001). Similar trends were observed for cardiovascular mortality (HR 1.44, 95% CI 0.85–2.44, P = 0.18). In similar unadjusted and adjusted analyses, compared with the current beer/wine drinkers (n = 203), liquor/mix drinkers (n = 142), but not aperitif drinkers (n = 273), had a significantly higher risk of all-cause (HR 3.07, 95% CI 1.39–6.79, P = 0.006), and cardiovascular mortality (HR 10.49, 95% CI 2.00–55.22, P = 0.006). Similar trends were observed for non-cardiovascular mortality (HR 1.94, 95% CI 0.73–5.16, P = 0.18).

Conclusions

Our study showed risks of mortality associated with past drinking and liquor drinking in the elderly Chinese men.

Alcohol Drinking Pattern and Risk of Head and Neck Cancer: A Nationwide Cohort Study

Alcohol consumption is a major risk factor for head and neck cancer (HNC), yet little data exist examining drinking patterns and HNC risk. In this population-based, retrospective cohort study, 11,737,467 subjects were recruited from the Korean National Health Insurance Service database. The risks of overall HNC and HNC subtypes according to average alcohol consumption, drinking frequency, and daily amount were examined using Cox proportional hazard models. Over the median follow-up of 6.4 years, 15,832 HNC cases were identified. HNC risk linearly increased with drinking frequency (p-trend < 0.01; adjusted hazard ratio [aHR] 1.55, 95% confidence interval [CI] 1.45–1.67 in subjects who drank 7 days/week). HNC risk also increased according to daily amount of alcohol consumption (p-trend < 0.01), but plateaued from 5–7 units/occasion (aHR 1.25, 95% CI 1.19–1.31) to >14 units/occasion (aHR 1.26, 95% CI 1.13–1.40). When stratified by average alcohol consumption, drinking frequency, but not daily amount, showed a linear relationship with HNC risk in moderate and heavy drinkers. When comparing the HNC subtypes, similar tendencies were observed in cancers of the oral cavity, pharynx, and larynx, but not in the salivary gland. In conclusion, drinking frequency is a stronger risk factor for HNC, especially for cancer of the oral cavity, pharynx, and larynx, than the daily amount of alcohol consumption.

Alcohol use trajectories across the life course: Influences of childhood predictors and consequences for late-life health

BACKGROUND

The cumulative, negative health effects of alcohol consumption are exacerbated in older adulthood. We used a 'life course epidemiology' approach to explore how alcohol use trajectories develop across the lifespan, what early life events influence these trajectories and their associations with late-life health.

METHODS

Survey data combined with retrospective life course history interviews were collected from 749 non-lifetime alcohol abstainer adults aged 61-81 years (51 % female). Frequency and quantity items of the AUDIT-C assessed alcohol use across each decade of life. Early life factors were childhood socioeconomic status, parental health behaviours, and age of drinking onset. Health outcomes were alcohol-related conditions.

RESULTS

Latent class growth analysis yielded two life course trajectories for women: consistently infrequent, low quantity drinking (Group 1: 48 %) and increasingly frequent, low quantity drinking (Group 2: 52 %). Men showed three trajectories: consistently infrequent, low quantity drinking (Group 3: 36 %); increasingly frequent, low quantity drinking (Group 4: 51 %); and drinking with increasing frequency and quantity until midlife, after which consumption gradually declined (Group 5: 13 %). Better childhood socioeconomic status was associated with Groups 2 and 4. Later drinking onset was associated with Groups 1 and 3. Parental alcohol misuse, early drinking initiation and childhood socioeconomic adversity were predictive of Group 5. Those in Group 5 were five-to-seven times more likely to have alcohol-related comorbidities.

CONCLUSIONS

Early life experiences influence life course hazardous alcohol use. Interventions across the life course, from childhood, when drinking may be initiated, through to older adulthood, when sensitivity to alcohol increases, are needed.

Differentiating Types of Self-Reported Alcohol Abstinence

We contrast three types of abstinence: quit after alcohol associated problems (Q-AP), quit for other reasons (Q-OR), and lifetime abstainer (LTA). We summarized the characteristics of people living with HIV (PLWH), and matched uninfected individuals, by levels of alcohol use and types of abstinence. We then identified factors that differentiate abstinence and determined whether the association with an alcohol biomarker or a genetic polymorphism is improved by differentiating abstinence. Among abstainers, 34% of PLWH and 38% of uninfected were Q-AP; 53% and 53% were Q-OR; and 12% and 10% were LTA. Logistic regression models found smoking, alcohol, cocaine, and hepatitis C increased odds of Q-AP, whereas smoking and marijuana decreased odds of LTA. Differentiating types of abstinence improved association. Q-APs and LTAs can be readily differentiated by an alcohol biomarker and genetic polymorphism. Differentiating type of abstinence may enhance understanding of alcohol health effects.

Ethanol and its metabolites: update on toxicity, benefits, and focus on immunomodulatory effects

This article summarizes recent experimental and epidemiological data on the toxic and beneficial effects of ethanol and its metabolites (acetaldehyde), and focuses on their immunomodulatory effects. The section dealing with the toxic effects of alcohol focuses on its chronic toxicity (liver disorders, carcinogenic effects, cardiovascular disorders, neuropsychic disorders, addiction and withdrawal syndrome, hematologic disorders, reprotoxicity, osteoporosis) although acute toxicity is considered. The role of oxidative metabolism of ethanol by alcohol dehydrogenase, cytochrome P450 2E1, and aldehyde dehydrogenase, as well as the impact of genetic polymorphism in its physiopathology are also highlighted. The section dealing with the beneficial effects of low to moderate alcohol consumption (on cardiovascular system, diabetes, the nervous system and sensory organs, autoimmune diseases, and rheumatology) highlights the importance of anti-inflammatory and immunomodulatory effects in these observations. This knowledge, enriched by a focus on the immunomodulatory effects of ethanol and its metabolites, in particular on the NLRP3 inflammasome pathway, might facilitate the development of treatments that can reduce ethanol's harmful effects or accentuate its beneficial effects.

Moderate alcohol consumption and lower total mortality risk: Justified doubts or established facts?

For almost a century, the scientific community is aware of the J-shaped curve between alcohol consumption and all-cause mortality. Moderate drinkers seem to live longer than both abstainers and heavy drinkers. These epidemiological observations regarding moderate alcohol consumption and beneficial health effects have been incessantly scrutinised for confounding and bias. This viewpoint discusses previous and recent criticisms regarding the J-shaped curve between alcohol consumption and total mortality risk. The controversies regarding the J-shaped curve between alcohol consumption and mortality are ongoing, as well as the debate among scientists in this area of research, resulting in conflicting messages in media and in different alcohol guidelines. Although it appears quite difficult to come up with a position statement only based on the currently available scientific data, it is imperative to fairly inform the public, without creating confusion and, worst case, disbelief in science.

Alcohol Consumption in Later Life and Mortality in the United States: Results from 9 Waves of the Health and Retirement Study

BACKGROUND

Alcohol consumption in later life has increased in the past decade, and the relationship between alcohol consumption and mortality is controversial. Recent studies suggest little, if any, health benefit to alcohol. Yet most rely on single-time point consumption assessments and minimal confounder adjustments.

METHODS

We report on 16 years of follow-up from the Health and Retirement Study (HRS) cohorts born 1931 to 1941 (N = 7,904, baseline mean age = 61, SD = 3.18). Respondents were queried about drinking frequency/quantity. Mortality was established via exit interviews and confirmed with the national death index. Time-varying confounders included but were not limited to household assets, smoking, body mass index, health/functioning, depression, chronic disease; time-invariant confounders included baseline age, education, sex, and race.

RESULTS

After adjustment, current abstainers had the highest risk of subsequent mortality, consistent with sick quitters, and moderate (men: HR = 0.74, 95% CI: 0.60 to 0.91; women: HR = 0.82, 95% CI: 0.63 to 1.07) drinking was associated with a lower mortality rate compared with occasional drinking, though smokers and men evidenced less of an inverse association. Quantitative bias analyses indicated that omitted confounders would need to be associated with ~4-fold increases in mortality rates for men and ~9-fold increases for women to change the results.

CONCLUSIONS

There are consistent associations between moderate/occasional drinking and lower mortality, though residual confounding remains a threat to validity. Continued efforts to conduct large-scale observational studies of alcohol consumption and mortality are needed to characterize the changing patterns of consumption in older age.

Cardiovascular effects of alcohol: A double-edged sword / how to remain at the nadir point of the J-Curve?

BACKGROUND

In addition to its established harmful effects on the liver and other organs, heavy alcohol use confers deleterious effects on the cardiovascular (CV) system, as well. However, data have emerged that light/moderate alcohol consumption (1 drink/day for women and 1-2 drinks/day for men) may be protective against CV disease.

OBJECTIVE/METHODS

English articles regarding the CV effects of alcohol/ethanol were reviewed by search in Medline, Scopus, and Google Scholar.

RESULTS

A J-shaped curve has been proposed to illustrate a differential effect of alcohol on the CV system with the lowest point on the curve (light/moderate drinking) corresponding to optimal exposure to alcohol, which may confer cardioprotection, the rather neutral effect of non-drinking, and the highest risk of heavy and/or binge drinking reflecting the consequence of harmful exposure. However, staying at the nadir of this J-shaped curve appears difficult. Furthermore, concern and distrust have also been raised about the quality of evidence for such "cardioprotection", emphasizing the need for further randomized controlled trials. Another concern relates to the risk of moderate drinking leading to problem drinking, since alcohol is the most common addictive substance.

CONCLUSION

Optimal exposure to alcohol (light/moderate use) means that one needs to stay at the nadir of the J-shaped curve for alcohol use to avail oneself of possible cardioprotection, and this may not be an easy thing to accomplish and/or adhere to, especially if one "likes" alcohol drinking. However, the evidence of "cardioprotection" conferred by alcohol has also been refuted, due to lack of randomized controlled trials.

Mortality in older adults with frequent alcohol consumption and use of drugs with addiction potential - The Nord Trøndelag Health Study 2006-2008 (HUNT3), Norway, a population-based study

Background

The aim of this study was to investigate whether frequent drinking, use of drugs with addiction potential and the possible combination of frequent drinking and use of prescribed drugs with addiction potential were associated with all-cause mortality in older adults.

Methods

We used data from the Nord-Trøndelag Health Study (HUNT3 2006–08), a population-based study in Norway. A total of 11,545 (6,084 women) individuals 65 years and older at baseline participated. We assessed frequent drinking (≥ 4 days a week), occasional drinking (i.e. a few times a year), never drinking and non-drinking in the last year. Drugs with addiction potential were defined as at least one prescription of benzodiazepines, z-hypnotics or opioids during one year for a minimum of two consecutive years between 2005 and 2009. This information was drawn from the Norwegian Prescription Database. The main outcome was all-cause mortality with information drawn from the Norwegian Cause of Death Registry. Follow-up continued until death or latest at 31 December 2013. Logistic regression analyses were used to investigate all-cause mortality since date of study entry and exact age at time of death was unknown.

Results

The adjusted logistic regression analyses showed that frequent drinking was not associated with all-cause mortality compared to occasional drinking. Men who reported to be never drinkers and non-drinkers in the last year had higher odds of mortality compared to those who drank occasionally. Use of prescribed drugs with addiction potential was associated with increased mortality in men, but not in women. No association was found between the possible combination of frequent drinking and use of prescribed drugs with addiction potential and mortality.

Conclusion

Neither frequent drinking nor the possible combination of frequent drinking and use of prescribed drugs with addiction potential were associated with all-cause mortality in older women and men. Use of prescribed drugs with addiction potential was associated with higher odds of mortality in men. This finding should lead to more caution in prescribing drugs with addiction potential to this group.

Alcohol consumption and all-cause mortality in older adults in Spain: an analysis accounting for the main methodological issues

BACKGROUND AND AIMS

Observational evidence that light-to-moderate alcohol consumption lowers mortality is questioned because of potential selection biases and residual confounding. We assess the association between alcohol intake and all-cause death in older adults after accounting for those methodological issues.

METHODS

Data came from 3045 individuals representative of the non-institutionalized population aged ≥ 60 years in Spain. Participants were recruited in 2008-10, when they reported current and life-time alcohol intake; drinkers were classified as occasional (< 1.43 g/day), light (≥ 1.43 but < 20 g/day for men and ≥ 1.43 but < 10 g/day for women), moderate (≥ 20 but < 40 g/day for men and ≥ 10 but < 20 g/day for women) or heavy (≥ 40 g/day for men and ≥ 24 g/day for women)/binge. Participants were followed-up to 2017 to assess vital status. In analyses, ex-drinkers were removed from the abstainer group and were classified according to their life-time intake to address the 'abstainer bias'. Moreover, analyses were replicated in individuals without functional limitations, and excluded deaths in the first year of follow-up, to address reverse causation. Also, occasional drinkers were used as reference in some analyses to reduce the 'healthy drinker/survivor' bias. Results were adjusted for many covariates to minimize residual confounding.

RESULTS

Compared with never-drinkers, the hazard ratio (95% confidence interval) of mortality for light drinkers was 1.05 (0.71-1.56) and 1.20 (0.72-2.02) in those without functional limitations. Corresponding values for moderate drinkers were 1.28 (0.81-2.02) and 1.55 (0.87-2.75) and for heavy/binge drinkers 1.85 (1.07-3.23) and 2.15 (1.09-4.22). Results were consistent when occasional drinkers were used as reference. Among drinkers without functional limitations, the hazard ratio (95% confidence interval) of mortality per 10 g/day of alcohol was 1.12 (1.02-1.23).

CONCLUSION

After accounting for potential biases, light-to-moderate drinking among people 60+ years of age appears to have no statistically significant benefit on mortality compared with abstention from alcohol. By contrast, heavy/binge drinking shows a higher death risk compared with abstention from alcohol. Alcohol intake appears to have a positive dose-response with mortality among drinkers.

Daily Drinking Is Associated with Increased Mortality

BACKGROUND

There is evidence that low-level alcohol use, drinking 1 to 2 drinks on occasion, is protective for cardiovascular disease, but increases the risk of cancer. Synthesizing the overall impact of low-level alcohol use on health is therefore complex. The objective of this paper was to examine the association between frequency of low-level drinking and mortality.

METHODS

Two data sets with self-reported alcohol use and mortality follow-up were analyzed: 340,668 individuals from the National Health Interview Survey (NHIS) and 93,653 individuals from the Veterans Health Administration (VA) outpatient medical records. Survival analyses were conducted to evaluate the association between low-level drinking frequency and mortality.

RESULTS

The minimum risk drinking frequency among those who drink 1 to 2 drinks per occasion was found to be 3.2 times weekly in the NHIS data, based on a continuous measure of drinking frequency, and 2 to 3 times weekly in the VA data. Relative to these individuals with minimum risk, individuals who drink 7 times weekly had an adjusted hazard ratio (HR) of all-cause mortality of 1.23 (p < 0.0001) in the NHIS data, and individuals who drink 4 to 7 times weekly in the VA data also had an adjusted HR of 1.23 (p = 0.01). Secondary analyses in the NHIS data showed that the minimum risk was drinking 4 times weekly for cardiovascular mortality, and drinking monthly or less for cancer mortality. The associations were consistent in stratified analyses of men, women, and never smokers.

CONCLUSIONS

The minimum risk of low-level drinking frequency for all-cause mortality appears to be approximately 3 occasions weekly. The robustness of this finding is highlighted in 2 distinctly different data sets: a large epidemiological data set and a data set of veterans sampled from an outpatient clinic. Daily drinking, even at low levels, is detrimental to one's health.

Alterations in microRNA expression associated with alcohol consumption in rectal cancer subjects

Purpose

Alcohol consumption has been purported to influence many diseases. MicroRNAs (miRNAs) may be influenced by compounds found in alcohol. In this investigation, we test the hypothesis that total alcohol, beer, wine, and hard liquor influence miRNA expression.

Methods

We studied 1447 colorectal (CR) cancer cases with normal CR mucosa and carcinoma miRNA expression data along with alcohol consumption data. We analyzed long-term and long-term and current (LTC) alcohol use for beer, liquor, and wine with miRNA expression between paired carcinoma and normal colon and rectal tissues, adjusting for multiple comparisons using the positive false discovery rate q-value. MiRNAs associated significantly with alcohol were examined with all-cause mortality (ACM). MiRNAs associated significantly with ACM were examined with RNA-Seq data.

Results

Expression of 84 miRNAs was associated significantly with LTC wine use in normal rectal mucosa. Higher expression of two of these miRNAs significantly worsened ACM: hsa-miR-210 (Hazard Ratio [HR] 1.12, 95% CI (1.03, 1.21), p-value = 0.004), and hsa-miR-92a-1-5p (HR 1.20, 95% CI (1.04, 1.38), p-value = 0.013). These miRNAs were downregulated across levels of LTC wine consumption.

Conclusions

Our results suggest that wine influences miRNA expression in rectal cancer, supporting the hypothesis that components in alcohol influence miRNA expression.

Electronic supplementary material

The online version of this article (doi:10.1007/s10552-017-0882-2) contains supplementary material, which is available to authorized users.

Selection biases in observational studies affect associations between 'moderate' alcohol consumption and mortality

Selection biases may lead to systematic overestimate of protective effects from 'moderate' alcohol consumption. Overall, most sources of selection bias favor low-volume drinkers in relation to non-drinkers. Studies that attempt to address these types of bias generally find attenuated or non-significant relationships between low-volume alcohol consumption and cardiovascular disease, which is the major source of possible protective effects on mortality from low-volume consumption. Furthermore, observed mortality effects among established low-volume consumers are of limited relevance to health-related decisions about whether to initiate consumption or to continue drinking purposefully into old age. Short of randomized trials with mortality end-points, there are a number of approaches that can minimize selection bias involving low-volume alcohol consumption.