Stephen Bartlett stopped drinking at 30, spent a year off alcohol, then decided to test his body’s reaction by drinking again. The result, by his own account: two glasses of wine, no notable intoxication, and three days of disrupted sleep, worse food choices, a missed gym session, and a podcast he felt went badly. He tracked all of it on his WHOOP device. The clip went viral. Half the internet mocked him. The other half quietly recognized exactly what he was describing.
The “Diary of a CEO” host split opinions sharply after the resurfaced clip showed him telling his guest that three glasses of wine had “ruined” his life for a few days. The mockery was predictable. But the underlying physiology is real, even if the framing was theatrical. The wine effects on body that Bartlett described – sleep disruption, poor eating, low motivation – aren’t unique to hyper-optimized podcasters. They follow from a set of biological mechanisms that most people experience to some degree and simply accept as normal.
The specific wine effects on body that Bartlett described map onto three overlapping systems: sleep architecture, metabolic function, and inflammation. Each one has a documented mechanism behind it.
The Sleep Trap
Wine’s after-effects come down significantly to the compounds it contains. The alcohol content in wine – typically between 11% and 14% – acts as a sedative initially, which is why a glass or two at dinner can feel relaxing and even make you drowsy. That sedative effect is real, but it’s also misleading.
Bartlett described it plainly: “I had a couple of glasses of wine, didn’t get drunk, it ruined three days of my life because of the domino effect that it caused.” That domino starts with sleep. Although alcohol may reduce sleep onset latency, it disrupts sleep architecture, suppresses REM sleep, increases sleep fragmentation, and impairs breathing during sleep, particularly in the second half of the night. According to a 2024 systematic review published in Sleep Medicine Reviews, this REM disruption follows a dose-response pattern: disruptions to REM sleep occurred following consumption of a low dose of alcohol – approximately two standard drinks – and progressively worsened with increasing doses of alcohol.
REM sleep – rapid eye movement sleep – is the phase your brain uses most actively. It plays a critical role in memory consolidation, emotional regulation, learning, and mental recovery. Skip enough of it and the next day feels cognitively foggy, emotionally flat, and motivationally dull – which maps almost exactly onto what Bartlett described.
Habitual alcohol consumption is associated with poorer subjective sleep quality, insomnia symptoms, and increased risk of sleep-disordered breathing. Even for people who don’t drink habitually, a 2025 narrative review in Nutrients on alcohol, wine, and sleep found that a single night of alcohol-suppressed REM can leave a measurable mark on the following day.
Wine also contains specific compounds that compound this problem. Tannins and histamines found in wine may cause headaches or nasal congestion, further interfering with sleep quality during the night. Red wines typically contain higher levels of both.
What Wine Does to Your Blood Sugar and Metabolism
The day-after food cravings that Bartlett mentioned – eating “more poorly” the next day – aren’t a willpower failure. They’re a metabolic response.
When you drink, the liver prioritizes breaking down alcohol over its usual role in regulating blood sugar. The immediate result is an initial spike in glucose levels. But that spike is temporary. Prolonged or excessive drinking can lead to hypoglycemia – low blood sugar – as the liver’s ability to release stored glucose becomes impaired. That blood sugar crash is one of the reasons people reach for carbohydrate-heavy foods the morning after drinking. The body is responding to a genuine energy deficit, not just a craving.
Beyond blood sugar, the metabolic disruption goes deeper. Excessive alcohol consumption disrupts metabolic processes far beyond the liver, leading to systemic dysfunctions that affect lipid and glucose metabolism, resulting in metabolic imbalances. A 2025 review in Frontiers in Toxicology found that these imbalances elevate the risk of type 2 diabetes, cardiovascular disease, and obesity. That’s the chronic picture. But even in the short term, the body’s metabolic detour after a few glasses of wine means nutrients aren’t being processed normally for several hours – potentially well into the following day.
The same research found that alcohol induces a cascade of reactive oxygen species (ROS)-mediated lipid peroxidation and NAD+ depletion, triggering mitochondrial dysfunction and metabolic imbalances in the liver, heart, pancreas, and brain. Mitochondria are the energy-producing structures inside your cells. When they’re not functioning properly, fatigue sets in. The gym session that “just doesn’t happen” the day after drinking has a cellular explanation.
Why Hangovers Are Worse Than Just Dehydration
The dehydration explanation for hangovers is popular and partly true. Alcohol inhibits vasopressin, an antidiuretic hormone that regulates the kidneys’ ability to reabsorb water – this is the mechanism behind wine’s diuretic effect and the associated dehydration. But dehydration alone doesn’t explain the full picture.
An increasing number of studies are focusing on the inflammatory response to alcohol as an important determinant of hangover severity. Hangover severity is significantly and positively correlated with blood concentrations of inflammatory biomarkers including IL-6, TNF-α, and C-reactive protein, according to research published in the Journal of Clinical Medicine. These are the same markers elevated in infections, chronic disease, and acute injury – which is why a bad hangover can feel physically similar to the early stages of flu. A 2024 review in Alcohol, Clinical and Experimental Research confirmed that moderate to high alcohol consumption leads to an inflammatory response which may result in hangovers.
For wine specifically, this matters because wine’s compound profile adds additional triggers. The tannins and histamines that affect sleep are also pro-inflammatory for people who are sensitive to them. Some people experience this reaction more acutely than others, and that variation has a genetic basis.
Why the Same Amount of Wine Hits People Differently
The dismissive reactions to Bartlett’s claim often came with a subtext: “I drink the same amount and feel totally fine.” Two people can drink the same glass of wine and have entirely different physiological responses – and that gap is not a matter of attitude or attention.
According to Dr. Tina Ghela MBBS, MRCGP, BSc, a GP at Medichecks, things like sex, genetics, and the specific ingredients in wine all play a role in how wine affects any individual. Body composition, hormonal profile, and liver enzyme activity all influence alcohol metabolism. Alcohol sensitivity can be a genetic condition where the body lacks the proper enzymes to break down alcohol efficiently – often involving a variant in the ALDH2 gene. People with this variant accumulate acetaldehyde, a toxic byproduct of alcohol metabolism, more quickly, intensifying the body’s reaction even to small amounts.
Both genetic and environmental factors contribute to variation in how alcohol affects people, and individual differences in vulnerability have been supported by research across multiple decades. Future work on personal and environmental factors that affect alcohol metabolism, and any differential effects of alcohol due to sex, is encouraged, according to the 2024 Sleep Medicine Reviews meta-analysis. Bartlett himself noted that after a year of abstinence, his body responded differently to alcohol than it had before. That’s plausible: the liver’s enzyme activity adapts over time, and a period of non-drinking can reduce tolerance significantly. Drinking again after a year off is physiologically different from drinking with a functioning tolerance.
The Wearable Factor
Bartlett tracked his three-day decline on a WHOOP band. BBC Radio 1 host Greg James pushed back directly, saying he was starting an “anti-optimization culture” – clarifying that his concern wasn’t with giving up alcohol, but with “this endless optimisation and measuring of everything to the point where it starts to make you feel a bit miserable if you don’t quite hit your own targets.”
The medical community has flagged a similar concern. Dr. Ghela cautioned that “wearable tech is making us become overly focused on bodily metrics in a way that may itself become unhelpful.” Overuse of wearable devices that continuously track bodily metrics can trigger distraction and anxiety in users – a phenomenon researchers have started studying as wearable technology becomes more widespread. Most wearables don’t actually measure stress or recovery directly – they infer these states from signals that correlate with autonomic nervous system activity, like heart rate variability and skin temperature.
That doesn’t mean the data is meaningless. Bartlett’s WHOOP almost certainly detected real disruptions in his heart rate variability and sleep stages. Those disruptions were physiologically real. The question is whether relentlessly tracking them amplifies the psychological impact of a single night of wine beyond what the body would otherwise recover from.
The Physiology Checks Out
The wine effects on body that Bartlett described are real and well-documented. Two glasses of wine may suppress REM sleep, spike and then crash blood sugar, trigger a mild inflammatory response, and disrupt metabolic function in ways that carry into the following day. For someone who had abstained for a year and then drank again, those effects could plausibly cascade across two to three days – particularly if the poor sleep led to worse food choices, which led to lower energy for exercise, which compounded the sleep debt.
Individual variation is real and significant. If you routinely drink two glasses of wine with dinner and wake up feeling fine, your liver enzyme profile, genetics, and established tolerance are doing work that Bartlett’s physiology wasn’t equipped to do after 12 months of abstinence. Neither experience invalidates the other.
For people who drink and notice that their sleep, energy, or food choices suffer the following day, the mechanism isn’t mysterious – it’s REM suppression, a blood sugar swing, and low-grade inflammation working together. The Dietary Guidelines for Americans recommends limiting alcohol to 1 drink or less per day for women and 2 drinks or less per day for men, according to the most recent edition at DietaryGuidelines.gov. For people who are highly sensitive – or who’ve taken a long break from alcohol – the body’s reaction to even a moderate amount can be more pronounced than past experience would suggest. Starting lower and observing how your body responds over several days is a more useful experiment than assuming your old tolerance still applies.
Disclaimer: This information is not intended to be a substitute for professional medical advice, diagnosis, or treatment and is for information only. Always seek the advice of your physician or another qualified health provider with any questions about your medical condition and/or current medication. Do not disregard professional medical advice or delay seeking advice or treatment because of something you have read here.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.
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