New study reveals that even a single daily drink may increase mortality risk in older adults, challenging long-held beliefs about 'safe' alcohol consumption

For decades, moderate alcohol consumption has been touted as potentially beneficial for health, particularly for cardiovascular protection. However, a groundbreaking study using data from the UK Biobank has shed new light on the risks associated with alcohol consumption among older adults, even at levels previously considered "low-risk." This research challenges long-held beliefs about the safety of moderate drinking and reveals concerning disparities in alcohol-related health outcomes based on socioeconomic status and pre-existing health conditions.

The Study:

Researchers analyzed data from 135,103 current drinkers aged 60 years or older, with a median follow-up of 12.4 years. Participants were classified into four drinking categories based on their average daily alcohol intake:

1. Occasional: ≤2.86 g/day (equivalent to about 1/4 of a standard drink or less per day)

2. Low risk: 

• Men: >2.86-20 g/day (about 1/4 to 1.5 standard drinks per day)
• Women: >2.86-10 g/day (about 1/4 to 3/4 of a standard drink per day)

3. Moderate risk:

• Men: >20-40 g/day (about 1.5 to 3 standard drinks per day)
• Women: >10-20 g/day (about 3/4 to 1.5 standard drinks per day)

4. High risk:

• Men: >40 g/day (more than 3 standard drinks per day)
• Women: >20 g/day (more than 1.5 standard drinks per day)

For reference, a standard drink in the United States contains about 14 grams of pure alcohol, which is typically found in:

• 12 ounces (355 ml) of regular beer (5% alcohol)
• 5 ounces (148 ml) of wine (12% alcohol)
• 1.5 ounces (44 ml) of distilled spirits (40% alcohol)¹

It's important to note that serving sizes and definitions of standard drinks can vary by country. The study was conducted in the UK, where a standard drink (or unit) contains 8 grams of pure alcohol, which is less than the US standard.² This difference in definitions underscores the importance of clear communication about alcohol quantities in public health messages.

The study examined associations between alcohol consumption patterns and all-cause, cancer, and cardiovascular disease (CVD) mortality, while also considering the impact of socioeconomic and health-related risk factors.³

Key Findings:

1. Low-Risk Drinking:

Contrary to previous studies suggesting protective effects, this research found that even low-risk drinking was associated with an 11% increase in cancer mortality compared to occasional drinking. This challenges the notion that there is a "safe" level of alcohol consumption, particularly for cancer risk.⁴

2. Moderate-Risk Drinking:

Moderate-risk drinkers showed a 10% higher risk of all-cause mortality and a 15% higher risk of cancer mortality compared to occasional drinkers. This finding is particularly significant as it contradicts previous research suggesting potential benefits or null effects for moderate alcohol consumption.⁵

3. High-Risk Drinking:

As expected, high-risk drinking was associated with increased mortality across all categories: 33% higher all-cause mortality, 39% higher cancer mortality, and 21% higher CVD mortality.⁶

4. Socioeconomic and Health-Related Risk Factors:

One of the most striking findings was the disproportionate impact of alcohol consumption on individuals with socioeconomic or health-related risk factors:

• Among those with health-related risk factors (assessed using a frailty index), even low-risk drinking was associated with a 15% higher cancer mortality.
• For individuals with socioeconomic risk factors (living in more deprived areas), both low-risk and moderate-risk drinking were associated with higher all-cause and cancer mortality. Low-risk drinkers in this group had a 14% higher risk of all-cause mortality and a 25% higher risk of cancer mortality compared to occasional drinkers.⁷

5. Drinking Patterns:

The study also examined the effects of wine preference and drinking only with meals:

• These patterns showed small protective associations with mortality, particularly from cancer, but only among drinkers with socioeconomic or health-related risk factors.
• Wine preference and drinking only with meals were associated with attenuating the excess mortality linked to high-, moderate-, and even low-risk drinking.⁸

Discussion:

This research challenges several long-held beliefs about alcohol consumption:

1. No Safe Level: The study suggests there may be no "safe" level of alcohol consumption, particularly concerning cancer risk. Even low-risk drinking was associated with increased cancer mortality in the overall sample.
2. Vulnerability of At-Risk Groups: The findings highlight that individuals with socioeconomic disadvantages or health-related risk factors are particularly vulnerable to the negative effects of alcohol, even at lower consumption levels.
3. Questioning Protective Effects: The lack of protective associations for low to moderate drinking in this study contradicts previous research suggesting cardiovascular benefits. This discrepancy may be due to methodological improvements, such as using occasional drinkers as the reference group instead of lifetime abstainers.
4. Drinking Patterns Matter: While wine preference and drinking only with meals showed some protective associations, these effects were mainly observed in at-risk groups. The researchers suggest this may reflect healthier overall lifestyles or slower alcohol absorption rather than direct benefits of the alcohol itself.⁹

​Implications:

This study has significant public health implications:

1. Revised Guidelines: Public health guidelines may need to be reconsidered, particularly for older adults and those with socioeconomic or health-related risk factors.
2. Personalized Advice: Healthcare providers should consider individual risk factors when advising patients about alcohol consumption.
3. Health Inequalities: The disproportionate impact on socioeconomically disadvantaged groups highlights the need for targeted interventions to address alcohol-related health inequalities.
4. Cancer Prevention: The consistent association between alcohol and cancer mortality, even at low levels of consumption, underscores the importance of alcohol reduction in cancer prevention strategies.

Conclusion:

This comprehensive study provides compelling evidence that challenges the perceived safety of moderate alcohol consumption, especially among older adults. It highlights the need for a more nuanced understanding of alcohol's health impacts, taking into account individual risk factors and drinking patterns. As our understanding of alcohol's effects continues to evolve, public health messages may need to shift towards a "less is better" approach, particularly for those at higher risk of alcohol-related harm.

The findings suggest that even what's often considered "moderate" drinking - as little as one drink per day for women or two for men - may carry significant health risks, especially for certain populations. This research underscores the importance of individual risk assessment and challenges the one-size-fits-all approach to alcohol consumption guidelines.

For older adults, especially those with health issues or from disadvantaged backgrounds, the message is clear: there may be no truly safe level of alcohol consumption. While complete abstinence may not be necessary for everyone, being aware of these risks and making informed decisions about alcohol use is crucial for maintaining long-term health and reducing mortality risk.

As we continue to unravel the complex relationship between alcohol and health, it's becoming increasingly clear that the potential risks of alcohol consumption may outweigh any purported benefits, even at levels previously thought to be safe or beneficial. This study serves as a wake-up call for both individuals and public health officials to reassess our relationship with alcohol and to prioritize evidence-based strategies for reducing alcohol-related harm.

References

1. National Institute on Alcohol Abuse and Alcoholism, "What Is A Standard Drink?", accessed May 15, 2024, https://www.niaaa.nih.gov/alcohols-effects-health/overview-alcohol-consumption/what-standard-drink

2. Department of Health and Social Care, UK Chief Medical Officers' Low Risk Drinking Guidelines, 2016, https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/545937/UK_CMOs__report.pdf

3. Rosario Ortolá et al., "Alcohol Consumption Patterns and Mortality Among Older Adults With Health-Related or Socioeconomic Risk Factors," JAMA Network Open 7, no. 8 (2024): e2424495.

4. Ibid.

5. Ibid.

6. Ibid.

7. Ibid.

8. Ibid.

9. Ibid.