The color in your glass matters less than what you do with it
Every morning after carries a question humanity has long tried to answer with simple rules: which drink is the culprit? Science now offers a more honest reply — darker spirits like bourbon carry far more fermentation byproducts than clear ones, and those compounds do worsen the body's reckoning, yet they remain a minor variable beside the older, humbler truths of how much we drink, how fast, and how well we care for ourselves in the hours between. The search for a healthier bottle may be less a medical inquiry than a marketing story we tell ourselves.
- A controlled study found bourbon contains 37 times more congeners than vodka, and participants who drank it woke up feeling measurably worse — giving the dark-versus-clear debate real, if limited, scientific weight.
- The tension lies in how quickly a partial truth becomes a convenient myth: the idea that choosing a clear spirit is a health decision has spread far beyond what the evidence actually supports.
- Experts from nutrition and addiction research are pushing back, insisting that total alcohol volume, drinking pace, hydration, sleep, and mixer ingredients collectively dwarf the effect of congeners on how the body recovers.
- Calories offer no escape route either — all distilled spirits deliver the same seven calories per gram of alcohol, and the real damage often arrives in the syrups and sodas poured alongside them.
- The story is landing not as a verdict on which bottle to choose, but as a redirection of attention toward behavior — toward the patterns and quantities that actually determine the morning after.
The morning after a night of drinking tends to produce a familiar search for a simple explanation. For years, the leading candidate has been color: darker spirits like bourbon, whiskey, and brandy are suspected of causing worse hangovers than clear ones like vodka or gin. The suspected mechanism involves congeners — fermentation byproducts that accumulate in greater quantities in aged, darker spirits.
A study published in Alcoholism: Clinical & Experimental Research gave this theory a direct test. Ninety-five healthy adults drank either bourbon or vodka across separate monitored nights, reaching comparable levels of intoxication. The results confirmed that bourbon contains roughly 37 times more congeners than vodka, and those who drank it reported noticeably worse symptoms the next morning. Researcher Jennifer Rohsenow noted that while alcohol itself is the primary driver of hangovers, bourbon made people feel substantially worse than the clear alternative.
But experts are careful not to let that finding carry more weight than it deserves. Registered dietitian Anya Argosh noted that drink color is not a meaningful nutritional variable, and professor Steve Allsop of Curtin University emphasized that the total amount of alcohol consumed matters far more than its shade. How quickly you drink, how well you sleep, how hydrated you stay, and how much sugar is in your mixers all shape the outcome more decisively than the color of the spirit.
Calories follow the same logic. Every distilled spirit delivers seven calories per gram of alcohol — clear or dark, it makes no difference. The real caloric variation comes from what gets mixed in: the syrups, juices, and sodas that can quietly transform a simple drink into something far heavier. The perception that transparent spirits are healthier, dietitian Roxana Ehsani observed, owes more to branding than to biology.
Darker drinks may indeed tip the scales toward a worse morning, but only as one thread in a larger pattern. The more useful question is not which bottle to reach for, but how much ends up in the glass — and everything that surrounds it.
The morning after a night of drinking, you wake with a pounding head and a simple question: which drink made you feel this way? The answer, it turns out, is more complicated than the color in your glass.
Researchers have long suspected that darker spirits—bourbon, whiskey, brandy—produce worse hangovers than their clear counterparts like vodka or gin. The culprit has a name: congeners, which are byproducts left behind during fermentation. A study published in Alcoholism: Clinical & Experimental Research put this theory to the test by comparing bourbon and vodka directly. Ninety-five healthy adults were monitored across two separate nights as they drank one spirit or the other until they reached similar levels of intoxication. The findings were striking: bourbon contains roughly 37 times more congeners than vodka. Those who drank bourbon reported noticeably worse hangover symptoms the next morning than those who had consumed vodka. As researcher Jennifer Rohsenow noted, while alcohol itself worsens hangovers compared to a placebo, bourbon made people feel substantially worse than the clear alternative.
Yet here is where the story becomes more nuanced. Experts across multiple health organizations agree that color alone does not determine how your body will respond. Anya Argosh, a registered dietitian, explained that from a nutritional and metabolic standpoint, the color of alcohol is not the primary variable at play. Steve Allsop, a professor at Curtin University's National Drug Research Institute, acknowledged that some people do notice darker drinks with higher congener levels make them feel worse the following day—but he was quick to emphasize that the actual amount of alcohol consumed has a far greater impact on the outcome.
The real drivers of a severe hangover are far more mundane than the shade of your drink. How much you consume matters most. So does how quickly you drink it. Sleep quality, hydration levels, and the sugar content in mixers all play substantial roles in determining how you feel the next morning. A vodka soda with high-fructose corn syrup might leave you feeling worse than a neat bourbon, depending on these other factors. The narrative that clear drinks are inherently healthier has more to do with marketing perception than scientific reality.
Calories tell a similar story. All distilled spirits contain seven calories per gram of alcohol, regardless of whether they are clear or dark. The meaningful caloric difference typically comes from what gets mixed into the drink—the syrups, sodas, and sweetened juices that transform a simple spirit into a cocktail. Roxana Ehsani, another registered dietitian, was direct about this: the idea that transparent drinks are more wholesome is driven far more by perception and branding than by any genuine nutritional advantage.
So the darker drink may indeed contribute to a worse hangover, but only as one factor among many. The color in your glass is less important than the total volume you consume, the pace at which you drink it, and the choices you make about what goes into the glass alongside the alcohol. Understanding this distinction matters because it shifts focus away from which bottle you reach for and toward the actual behaviors that determine how you will feel tomorrow.
Notable Quotes
Although alcohol already increased hangover sensation compared to placebo, bourbon made people feel even worse than vodka— Jennifer Rohsenow, researcher
The amount of alcohol ingested has a much greater impact on the outcome than congener content— Steve Allsop, Curtin University National Drug Research Institute
The idea that clear drinks are healthier is driven much more by perception and marketing than by real nutritional differences— Roxana Ehsani, registered dietitian
The Hearth Conversation Another angle on the story
So the study found bourbon causes worse hangovers than vodka. Does that mean I should just switch to clear spirits?
Not necessarily. The bourbon had 37 times more congeners, which did make people feel worse—but only when they drank equal amounts. If you drink less bourbon or more vodka, the equation changes entirely.
What are congeners, exactly? Why do they matter if alcohol is the main culprit?
They're fermentation byproducts that accumulate in darker spirits. They seem to amplify the hangover effect, but they're secondary to the total alcohol dose. Think of them as making a bad situation slightly worse, not creating the bad situation itself.
The article mentions sleep and hydration matter more. How much more?
Significantly. You could drink bourbon and sleep well with proper hydration and feel fine. Or drink vodka, stay up late, and feel terrible. The color becomes almost irrelevant once those factors enter the picture.
What about the marketing angle—why do clear drinks get sold as healthier?
Because they look pure and clean. But a vodka soda with sugary mixer has the same calories as bourbon neat, plus extra sugar. The visual impression sells the health claim, not the actual chemistry.
So what's the practical takeaway for someone who wants to drink responsibly?
Forget the color. Focus on how much you drink, how fast, whether you're eating, how much water you're drinking alongside it, and whether you're getting sleep. Those variables dwarf any difference between bourbon and vodka.