Alcohol intake
units / week
Dose-dependent endocrine and decision disruptor.
Heavy use lowers T, fragments sleep, and taxes next-day risk and status behavior. Light use is entangled with sociability and class. Do not draw a straight line from 'a drink' to leadership.
Also called ethanol.
Connected relationships
Mendelian randomization · Contested
Alcohol intake→Cognitive performance
A rise in Alcohol intake does not identify a change in Cognitive performance.
Almeida 2014 and Campbell 2024 find no Mendelian randomization effect of adult alcohol on cognitive impairment or Alzheimer disease; Cui 2022, with 235 genotyped rural Chinese adults, finds more drinking and more mild cognitive impairment.
Mendelian randomization · Moderate
Alcohol intake→Major cardiovascular events
Higher Alcohol intake increases Major cardiovascular events.
Holmes 2014 found that a gene variant that cuts weekly drinking by 17 percent also cut the odds of coronary heart disease by 10 percent in 261,991 European adults (odds ratio 0.90, 0.84 to 0.96). Millwood 2019 found genetically predicted drinking raised stroke in Chinese men and left heart attack unmoved.
Mendelian randomization · Contested
Alcohol intake→Depression
Higher Alcohol intake moves Depression only in some conditions. Read the mechanism.
Three Mendelian randomization files of alcohol on depression disagree: two ADH variants in 68,486 Copenhagen adults are null for antidepressant use, UK Biobank beer and spirits instruments raise major depression until insomnia and smoking enter the model, and ALDH2 plus ADH1B in 476 Chinese adults point the other way.
Mendelian randomization · Moderate
Alcohol intake→All-cause mortality
Higher Alcohol intake increases All-cause mortality.
Kassaw 2024 found a linear Mendelian randomization rise in all-cause death with genetically predicted alcohol in 278,093 white-British UK Biobank adults: odds ratio 1.27 (1.16 to 1.39) per extra 8 grams a day.
Review · High confidence
Alcohol intake→Sleep duration and regularity
Higher Alcohol intake decreases Sleep duration and regularity.
Evening alcohol, 1.0 grams per kilogram in men and 0.85 in women, cut total sleep time from 436.6 to 421.3 minutes and sleep efficiency from 91.2 to 88.0 percent in thirty-one social drinkers on a randomized crossover with overnight PSG.
Review · Moderate
Alcohol intake→Testosterone
Higher Alcohol intake moves Testosterone in a non-linear way. Dose or timing can flip the sign.
Heavy chronic drinking suppresses male testosterone. A 0.5 g/kg drink raised plasma T in thirteen men. Three weeks of 40 grams a day lowered it 6.8 percent in ten men on a controlled diet. A glass of wine is not a T protocol in reverse.
Randomized trial · Contested
GLP-1 receptor agonist→Alcohol intake
Higher GLP-1 receptor agonist decreases Alcohol intake.
In 108 people seeking treatment for alcohol use disorder and obesity, weekly semaglutide 2.4 mg plus usual therapy cut heavy-drinking days by about 14 percentage points versus placebo plus the same therapy (Klausen 2026). An earlier exenatide trial missed that same primary end point.
Cases
Sources
- OP Almeida et al. (2014). Alcohol consumption and cognitive impairment in older men: a mendelian randomization study.
- Y Cui et al. (2022). Alcohol Consumption and Mild Cognitive Impairment: A Mendelian Randomization Study from Rural China.
- KA Campbell et al. (2024). Relationship between alcohol consumption and dementia with Mendelian randomization approaches among older adults in the United States.
- MV Holmes et al. (2014). Association between alcohol and cardiovascular disease: Mendelian randomisation analysis based on individual participant data.
- IY Millwood et al. (2019). Conventional and genetic evidence on alcohol and vascular disease aetiology: a prospective study of 500 000 men and women in China.
- SC Larsson et al. (2021). Alcohol Consumption and Cardiovascular Disease: A Mendelian Randomization Study.
- DB Rosoff et al. (2021). Evaluating the relationship between alcohol consumption, tobacco use, and cardiovascular disease: A multivariable Mendelian randomization study.
- J Lankester et al. (2021). Alcohol use and cardiometabolic risk in the UK Biobank: A Mendelian randomization study.
- MK Wium-Andersen et al. (2016). Increased alcohol consumption as a cause of alcoholism, without similar evidence for depression: a Mendelian randomization study.
- C Zhu et al. (2020). Alcohol Use and Depression: A Mendelian Randomization Study From China.
- D Qiu et al. (2024). Associations between dairy and alcohol consumption and major depressive disorder in a mendelian randomization study.
- NA Kassaw et al. (2024). Alcohol consumption and the risk of all-cause and cause-specific mortality-a linear and nonlinear Mendelian randomization study.
- M. A. Emanuele et al. (2001). Alcohol and the male reproductive system
- K. Spiegel et al. (1999). Impact of sleep debt on metabolic and endocrine function
- E Pabon et al. (2022). Effects of alcohol on sleep and nocturnal heart rate: Relationships to intoxication and morning-after effects.
- T Sarkola et al. (2003). Testosterone increases in men after a low dose of alcohol.