Everything you've ever wanted to know about hangovers - The Food Chain podcast, BBC World Service

Key Concepts

• Hangover: A cluster of negative symptoms experienced after alcohol consumption when blood alcohol levels return to zero. Distinct from alcohol intoxication.
• Alcohol Metabolism: The process by which the body breaks down alcohol, producing toxic metabolites like acetaldehyde and triggering an inflammatory response.
• Inflammatory Response: The body’s defense mechanism against toxins, involving the release of cytokines and other inflammatory markers.
• Gut-Brain Axis: The bidirectional communication pathway between the gut microbiome and the brain, influencing hangover severity.
• Glycemic Index (GI): A measure of how quickly a food raises blood sugar levels; slow-release carbs are preferred during a hangover.
• Acetaldehyde: A toxic byproduct of alcohol metabolism that contributes to hangover symptoms.
• Cytokines: Inflammatory markers released by the body in response to toxins like alcohol.
• Ultra-Processed Foods: Foods high in sugar, fat, and salt, often contributing to inflammation and potentially worsening hangovers.

The Science and Culture of Hangovers: A Detailed Examination

I. Defining the Hangover & Physiological Processes

The program centers around understanding the hangover – defined as the constellation of negative symptoms following alcohol consumption when blood alcohol concentration (BAC) reaches zero. Professor Andrew Scholey clarifies that a hangover is not simply residual alcohol in the system, a previously held belief. Instead, it’s a complex physiological response.

Alcohol is absorbed into the bloodstream and distributed throughout the body, including the brain, causing intoxication. It’s then broken down by enzymes like alcohol dehydrogenase, producing acetaldehyde – a toxic metabolite. This triggers an inflammatory response, releasing inflammatory markers like cytokines (including interleukins and C-reactive proteins) similar to those released during an infection. This inflammation impacts brain function directly and indirectly through cerebral vasculature (blood flow to the brain), contributing to hangover symptoms.

Remarkably, Scholey points out that someone experiencing a hangover can exhibit driving impairment equivalent to someone at the legal drink-driving limit, despite having a zero BAC. This highlights the lack of a specific biomarker for hangover diagnosis.

II. Individual Variability & Genetic Factors

Hangover susceptibility varies significantly between individuals. Scholey notes genetic differences play a role, with some people reporting “alcohol resistance.” These individuals often consume alcohol less frequently or at a slower pace. Variations in the alcohol dehydrogenase enzyme also influence hangover severity; those who metabolize alcohol more quickly tend to experience milder symptoms.

III. The Literary & Cultural Perspective on Hangovers

Professor Jonathon Shears explores the cultural significance of hangovers in literature. He argues that hangovers evoke a range of emotional responses – embarrassment, shame, guilt – beyond just physical discomfort. He cites Robert Burns’s “miserable blank in his heart” as a poignant literary depiction of post-drinking regret. Lord Byron’s line about wine, women, and “sermons and to water the day after” encapsulates the cycle of indulgence and repentance.

Shears also discusses the portrayal of hangover cures in literature, highlighting the chaotic remedies like Bridget Jones’s “hangover buffet” (chocolate eclairs and sausages) and historical concoctions like the Prairie Oyster Cocktail (brandy and raw egg yolk). These examples reflect a search for comfort and a “kill or cure” mentality.

IV. Dietary Approaches to Hangovers: Prevention & Cure

The discussion pivots to dietary strategies. Initial anecdotal evidence from individuals at a Berlin market (Nicola – poached eggs & black Turkish tea; Alina – sushi; Jess – coffee & pizza; Penny – soft, soupy foods like ashoka tofu) reveals diverse preferences.

Marisa Moll, a registered nutritionist, emphasizes the importance of gut health and the gut-brain axis. She advocates for preventative dietary measures, focusing on consuming good fats (avocado, olive oil) and high-protein foods (chicken, eggs) before drinking. Diluting acetaldehyde by alternating alcoholic beverages with water is also recommended. She strongly discourages greasy, processed foods.

Scholey’s research suggests zinc and niacin (vitamin B3) – found in shellfish, red meat, and legumes – may mitigate hangover severity when consumed as part of a regular diet. He cautions against relying on marketed “hangover cures,” finding no evidence of efficacy in a review of 100 top-selling products. He does acknowledge the potential benefit of consuming protein and fats before drinking to slow gastric emptying and reduce alcohol absorption.

Moll suggests a balanced approach: allowing some comfort food after prioritizing nutrient-rich options like chicken soup and green juice. She attributes the craving for ultra-processed foods to the brain’s “compensation circuit” seeking immediate gratification.

V. The Role of Inflammation & Ultra-Processed Foods

Scholey stresses that consuming ultra-processed foods exacerbates inflammation, worsening hangover symptoms. He recommends avoiding these foods altogether, particularly during and after alcohol consumption. He emphasizes that the body is already battling inflammation due to alcohol metabolism, and adding pro-inflammatory foods compounds the problem.

VI. The Ultimate Hangover Cure: Lifestyle & Moderation

The consensus among the experts is that the most effective “cure” is prevention: avoiding excessive alcohol consumption. Moll emphasizes the importance of a holistic lifestyle – a healthy diet, adequate sleep, regular exercise, and stress management – as a long-term strategy for minimizing hangover severity. She states, “a hangover is months in the preparation,” highlighting the cumulative effect of lifestyle choices.

VII. Data & Research Findings

• A study of 100 top-selling “hangover cures” on Amazon revealed zero products with evidence of efficacy.
• Research suggests consuming a meal rich in protein and fats before drinking can halve the amount of alcohol entering the bloodstream.
• Driving impairment during a hangover can be equivalent to driving at the legal drink-driving limit, despite a zero BAC.

Conclusion:

The program underscores that hangovers are complex physiological responses, not simply the result of residual alcohol. Prevention through moderation and a healthy lifestyle is paramount. While dietary interventions can play a role, focusing on gut health, nutrient-rich foods before drinking, and avoiding ultra-processed foods are key. The search for a quick fix “cure” is largely futile, as evidenced by the lack of scientific support for marketed products. Ultimately, understanding the science behind hangovers empowers individuals to make informed choices and prioritize their well-being.